What is Auto lensometer: Uses, Safety, Operation, and top Manufacturers!

Introduction

Auto lensometer is a clinical device used to measure key optical parameters of spectacle lenses—typically sphere, cylinder, axis, prism, and near addition—so teams can verify and document eyewear accurately and consistently. In hospital eye departments, outpatient clinics, and optical services, it supports safer workflows by helping staff confirm what a patient is wearing (or what has been dispensed) before results are recorded, glasses are remade, or care pathways proceed.

For hospital administrators and procurement teams, Auto lensometer selection affects service quality, staffing efficiency, and lifecycle costs (maintenance, calibration, downtime planning, and consumables like printer paper and marking ink). For clinicians and biomedical engineers, performance depends on correct setup, routine verification, cleaning discipline, and an understanding of output limitations—especially for progressive lenses and atypical lens designs.

This article provides practical, non-medical guidance on uses, safety, basic operation, output interpretation, troubleshooting, infection control, and a globally aware market overview—written for healthcare operations leaders who need dependable, audit-ready processes.

A helpful way to think about an Auto lensometer is that it sits between clinical care and optical manufacturing: it does not test vision, but it provides objective information about the lenses that influence vision. It is often confused with an autorefractor (which estimates refractive error of the eye). An Auto lensometer instead measures the lens in the frame, supporting documentation, verification, and quality control.

Terminology also varies by country and supplier. You may see the same device category described as an Auto lensometer, lensmeter, digital lensmeter, or (auto) focimeter. Despite naming differences, the operational goal is the same: produce consistent lens power and alignment readings with minimal operator variability.

What is Auto lensometer and why do we use it?

Auto lensometer is medical equipment designed to automatically measure the optical power and alignment characteristics of spectacle lenses (and, in some models, additional lens attributes). It is a modern alternative to manual lensometers (also called lensmeters or focimeters), reducing operator dependency by using sensors and software to capture readings and display results digitally.

In practical hospital terms, it is a verification tool: it helps answer “what’s in this pair of glasses?” quickly and in a way that is repeatable across different staff members, shifts, and sites. This becomes especially important when your service has rotating staff, trainees, multiple clinic rooms, or satellite sites that need to produce comparable documentation.

Definition and core purpose

At a practical level, Auto lensometer helps teams answer a simple operational question: “What is the optical prescription of this lens right now?” Typical measurements include:

Sphere (SPH): primary lens power
Cylinder (CYL) and Axis: astigmatism magnitude and orientation
Prism and Base direction: lens-induced image displacement
Add (ADD): near addition for multifocal/progressive designs
Other attributes (optional): varies by manufacturer (for example, UV transmission estimates, lens type detection, or data connectivity features)

The device is generally used on the patient’s glasses (or newly dispensed lenses) rather than on the patient’s eye—so the primary safety value is preventing documentation errors and eyewear verification mistakes.

In many hospitals, the Auto lensometer also supports standardization across the “optics-to-record” pathway. A typical chain might be:

Glasses arrive (existing eyewear, new dispense, remake request, or external referral).
Lens powers are measured and documented.
Values are compared against an order, a previous record, or an expected tolerance.
A decision is made (record as baseline, accept as correct, remake, or escalate for review).

Because the device output is often used downstream (for ordering, remakes, reporting, or medicolegal documentation), its core purpose is not just measurement—it is repeatable measurement with traceability.

Power reference points (why orientation matters)

Although most users think of “the lens power” as one number, the instrument is actually measuring at a specific reference:

Back vertex power is commonly used for spectacle lenses (how the lens behaves at the back surface relative to the eye).
Front vertex power or other reference conventions may be relevant in some modes or workflows.
For multifocals and progressives, power varies across the lens surface, so where you measure matters as much as what you measure.

This is why most manufacturers specify lens orientation (often the back surface toward the instrument) and provide progressive prompts to guide distance/near measurements.

Common clinical settings

Auto lensometer may be found in:

Hospital ophthalmology and optometry clinics
Pre-assessment areas where eyewear details are documented
In-house optical dispensing and optical laboratories
Ambulatory eye centers and high-volume outpatient departments
Mobile eye clinics (where robustness and portability matter)

In many systems, it sits at the “front end” of the visual workflow: verifying existing eyewear before subjective refraction, documenting baseline correction, or confirming that dispensed spectacles match an order.

Additional settings where Auto lensometers are commonly used include:

Orthoptic and neuro-ophthalmology workflows, where prism verification may be frequently relevant for documentation and remake decisions.
Low-vision services, where patients may present with multiple pairs of glasses and documentation of what each pair does (distance vs near) helps reduce confusion.
Teaching clinics, where a digital display and printout can support training and supervision without relying solely on a trainee’s manual lensmeter technique.
Optical lab receiving areas, where incoming jobs (or returned remakes) are checked against job tickets to identify supplier issues early.

Key benefits in patient care and workflow

For healthcare operations, the value is often less about “new capability” and more about standardization:

Speed and throughput: faster lens reading than fully manual methods in many workflows
Repeatability: reduced variability between operators (though training still matters)
Digital documentation: easier printing/export of measurements to records (connectivity varies by manufacturer)
Progressive lens support: automated identification and measurement steps for many PAL designs (accuracy may vary with lens design and condition)
Reduced rework: fewer remakes and fewer “unclear” lens readings when staff change or rotate

For biomedical engineering and quality teams, Auto lensometer can also be easier to verify routinely because many models support a straightforward check using a reference lens (method varies by manufacturer).

Beyond these headline benefits, many teams also value:

Consistency across multiple sites: standardized presets (plus/minus cylinder, rounding, print layout) help reduce cross-site confusion.
Lower cognitive load for non-specialist users: digital prompts can guide correct measurement zones for progressives and reduce reliance on “craft skills.”
Improved handovers: a printout attached to a job bag or scanned into a record can reduce misunderstandings between clinics, optical labs, and external suppliers.
Faster identification of “what went wrong”: when a remake is requested, lensometer values provide objective evidence for whether the issue is lens power, axis, prism, or fitting/centring.

How an Auto lensometer works (conceptual overview)

Exact designs vary, but many Auto lensometers work using a consistent high-level approach:

The instrument projects a target or pattern of light through the lens.
Internal optics and sensors detect how the target is focused or displaced.
Software calculates refractive power in different meridians to determine SPH/CYL/AX.
The displacement of the target relative to a reference can be used to calculate prism and base direction.
For progressive lenses, the device may scan or prompt measurements in multiple regions to estimate distance power, near power, and ADD.

Common internal sensing technologies include camera-based systems and sensor arrays. From a user perspective, what matters operationally is not the sensor type but the repeatability of readings, stability indicators, and how well the device guides the operator to measure the correct area of the lens.

Auto vs manual lensometer (operational comparison)

Both device types can be appropriate in a hospital setting. A simplified comparison helps clarify why some services keep both:

Aspect	Auto lensometer	Manual lensometer
Operator dependency	Lower (guided prompts)	Higher (technique-driven)
Speed in routine cases	Often faster	Often slower for inexperienced users
Unusual lenses / tricky frames	May struggle depending on design	Can be more flexible in skilled hands
Training needs	Still required, but often shorter for basic reads	Requires more practice to become consistent
Documentation	Digital display/print/export (model-dependent)	Often manual transcription unless paired with systems
Verification routines	Often simple check-lens workflow	Also possible, but more technique-dependent

For administrators, this comparison is useful when planning resilience: an Auto lensometer improves standardization, while a manual lensometer can serve as a robust fallback and a cross-check tool for outlier cases.

When should I use Auto lensometer (and when should I not)?

Auto lensometer is a hospital equipment tool for eyewear verification and documentation. It is most effective when used as part of a defined process with clear responsibilities, tolerances, and escalation routes.

A practical governance approach is to define:

Who is allowed to perform measurements (role-based authorization).
What gets documented (full SPH/CYL/AX/prism/add vs partial).
Where results are stored (paper printout, EHR entry, scanned attachment, optical lab job ticket).
When a second check is required (out-of-range, high prism, inconsistent readings, remake triggers).

Appropriate use cases

Use Auto lensometer when your workflow needs one or more of the following:

Documenting the prescription of a patient’s current spectacles for the clinical record
Verifying that new spectacles match the ordered specification (QC check)
Confirming prism presence/direction when a verification step is required by your service
Checking lens parameters before lens replacement, frame repair, or lens re-edge work
Supporting optical dispensing services with standardized, print-ready readings
Routine audits and quality checks in an optical lab environment

From an operational perspective, it is especially useful in high-volume clinics where documentation consistency and handover clarity matter.

Additional common use cases include:

Baseline documentation for referrals: when patients arrive from external providers without a clear written prescription, measuring existing eyewear can support communication and reduce rework.
Triage and intake documentation: quickly identifying whether a patient’s glasses are distance-only, near-only, or multifocal can streamline clinic flow (without making clinical decisions from the measurement alone).
Verification of spare/backup glasses: patients often bring multiple pairs; confirming which is most current can reduce confusion.
Supplier dispute resolution: objective measurement printouts help clarify whether an issue is a manufacturing mismatch versus fitting/centring or patient adaptation concerns.
Research, audit, and service evaluation: standardized lens measurements can support non-clinical audits of dispensing accuracy, turnaround times, and remake rates.

Situations where it may not be suitable

Auto lensometer is not a universal solution, and limitations should be recognized upfront:

Not a substitute for refraction or clinical decision-making: it measures lenses, not visual function
Very unusual lens designs: wrap-around frames, highly aspheric/freeform lenses, or heavily decentered optics can be challenging (varies by manufacturer)
Damaged or contaminated lenses: scratches, smudges, cracks, severe coating defects, or residue can destabilize readings
Out-of-range prescriptions: maximum measurable power and prism ranges vary by manufacturer
Contact lens measurement: some models support contact lens measurement modes; others do not (varies by manufacturer)

If the device repeatedly produces inconsistent results, a manual cross-check (manual lensometer or known-good reference method) is often a safer operational step than forcing a “best guess.”

Other situations that can reduce reliability or increase recheck rates include:

Very small lenses or narrow eye shapes where the measurement area is limited and clamping is awkward.
Heavily tinted, mirrored, or highly reflective coatings that interfere with internal sensors or reduce target contrast.
Photochromic lenses in transition (partially darkened) where optical conditions are changing; allowing the lens to stabilize can improve repeatability.
Lenses with significant warpage from heat exposure or frame stress, where different zones may show inconsistent power.
Frames that cannot sit flat on the lens table due to curvature or protruding design elements, causing tilt during measurement.

A helpful operational rule is: if you cannot achieve a stable, repeatable measurement after cleaning and reseating, stop and cross-check rather than accepting a “close enough” value.

Safety cautions and contraindications (general, non-clinical)

There are usually no patient-specific “contraindications” because the device typically does not contact the patient. However, safety risks still exist:

Incorrect documentation risk: transposition errors (plus/minus cylinder), axis misreads, or wrong-eye entry can propagate downstream errors
Infection control risk: patient eyewear can be contaminated; handling without cleaning can transmit pathogens to staff and surfaces
Physical damage risk: lens clamps/holders and marking mechanisms can scratch lenses if mishandled
Electrical and environmental risk: liquids near electronics, poor grounding, unstable benches, and cable trip hazards
Data privacy risk: if patient identifiers are entered or exported, local privacy policies must be followed

When in doubt, follow facility protocols and manufacturer instructions for use (IFU). If those differ, escalate to clinical governance/biomedical engineering for a documented local decision.

From a broader risk-management perspective, consider also:

Ergonomic strain: repeated measurements with poor bench height or awkward posture can contribute to staff fatigue and errors over time. A stable chair height and clear workspace reduce rushed technique.
Chemical compatibility: cleaning agents that damage plastic windows or sensor covers can cause progressive performance issues that look like “random bad readings.”
Process drift: if teams develop informal shortcuts (skipping cleaning, not verifying reference lens, not repeating unstable reads), errors become more likely and harder to detect.

What do I need before starting?

Reliable results depend on basic readiness: the right environment, the right accessories, and staff competency. For auditability, you also need consistent documentation.

Required setup, environment, and accessories

Typical prerequisites include:

Stable work surface: vibration and bench instability can affect repeatability
Controlled environment: avoid direct sunlight/glare on sensors or screens; keep dust exposure low
Power quality: grounded outlet, cable management, and surge protection per facility policy
Device accessories (common):
Reference/check lens (if supplied/required; varies by manufacturer)
Marking ink/marker pins (if the model supports lens marking)
Printer paper (if an integrated printer is present)
Cleaning supplies (lint-free cloth, approved wipes)
Dust cover when not in use

If connectivity is part of the procurement requirement, confirm early whether the model supports USB, LAN, Wi‑Fi, or proprietary integration (varies by manufacturer), and align with your IT security requirements.

Additional environment details that can improve consistency:

Lighting control: strong directional lighting or reflections can affect some sensors. A shaded measurement area or consistent overhead lighting helps.
Clear “clean zone” around the device: avoid storing sprays, drinks, or loose tools near the lensometer to reduce spill risk and accidental knocks.
Temperature and humidity awareness: extreme conditions can affect electronics and optics over time. Even if the device tolerates a wide range, stable conditions support consistent output and longer component life.
Physical placement: leave enough space for frame temples and larger frames so staff do not twist or force spectacles into position.

Accessories that are easy to overlook

Depending on your workflow and model, teams may also need:

Spare printer paper rolls (and a defined storage spot so staff do not “borrow” from other devices).
Spare marking ink with an agreed reorder level to prevent last-minute workarounds.
A small tray or clean mat for spectacles to reduce contamination and prevent frames falling.
A basic lens cleaning kit that is compatible with common coatings and does not leave residue.
A local quick-reference card (laminated or near the device) for plus/minus cylinder format, prism notation, and escalation steps.

Training and competency expectations

Auto lensometer reduces manual steps, but it does not remove the need for training. A minimum competency profile often includes:

Understanding SPH/CYL/AX and prism conventions
Recognizing single vision vs bifocal vs progressive lens layouts
Knowing how to avoid plus/minus cylinder confusion and transposition mistakes
Correct lens positioning and alignment technique
Interpreting “unstable” readings and when to repeat, clean, or escalate
Safe cleaning/disinfection compatible with device materials (per IFU)

For hospitals, it is reasonable to treat this as a competency-managed medical device with initial training, periodic refreshers, and documented authorization to use.

To make training more operational (and less theoretical), many facilities include scenario-based checks such as:

Measure a known single-vision lens twice and confirm repeatability within local tolerance.
Measure a progressive lens following on-screen prompts and correctly document distance and near values.
Demonstrate correct right/left lens identification and consistent labeling.
Demonstrate a “stop and escalate” response when readings are unstable or the device fails a verification check.
Demonstrate correct cleaning and disinfection steps without fluid ingress.

A simple competency sign-off form often works well: name, date, trainer, device model, and a short checklist of demonstrated tasks. This supports audit readiness and reduces reliance on informal “shadowing” that may not cover safety-critical steps.

Pre-use checks and documentation

A practical pre-use routine (adapt to your facility) often includes:

Visual inspection: casing intact, lens table clean, clamp mechanism smooth
Power-on self-test: confirm no error messages and screen/controls respond
Date/time check: important when printing or exporting logs
Consumables check: printer paper and marker ink (if applicable)
Verification check: many facilities perform a quick check with a reference lens at the start of day/shift (frequency varies by manufacturer and policy)
Documentation: record daily checks, faults, and service events in a log (paper or CMMS)

Where accreditation applies, consistency matters more than complexity: a simple checklist done reliably is often safer than an elaborate process done inconsistently.

Additional pre-use checks that can reduce “mystery failures” during busy clinics:

Confirm cylinder format (plus or minus) matches your local documentation standard before measuring patient eyewear.
Run a test print if the printer is used for clinical workflow, especially after paper replacement.
Check marking quality (if marking is used): a faint mark can lead to mis-centring downstream in the optical lab.
Confirm connectivity status (if networked): ensure the device is on the correct network segment and that export targets are available.
Review the fault log briefly: recurring minor errors can indicate a developing mechanical or optical issue.

For biomedical engineering teams, the pre-use documentation becomes part of lifecycle management. Trend data (for example, increasing verification failures) can guide preventive maintenance and reduce unplanned downtime.

How do I use it correctly (basic operation)?

Specific buttons and screens vary by manufacturer, but the workflow is usually consistent. The goal is stable alignment, correct mode selection, and accurate recording.

Basic step-by-step workflow

Prepare the device – Power on and allow any warm-up period (varies by manufacturer).
– Confirm the correct measurement mode (single vision, progressive, etc.).
– Ensure the lens table and clamp surfaces are clean and dry.
Prepare the spectacles – Verify patient identifiers only if you are entering data into the device or printout.
– Clean lenses gently to remove fingerprints and dust.
– Identify right/left lens if known; check for progressive markings if present.
Position the lens – Open the clamp/lens holder.
– Place the lens in the recommended orientation (commonly back surface toward the instrument for back vertex power; confirm with IFU).
– Seat the frame/lens evenly so it does not rock or tilt.
– Close the clamp gently—avoid excessive force.
Acquire the measurement – Use the alignment controls (often a joystick) to center the target.
– Allow the device to auto-read and display values.
– If the reading is unstable, pause and troubleshoot: re-clean, re-seat, reduce glare, or switch the lens mode.
Measure special lens types (as needed) – For progressive lenses, many devices require you to measure specific zones (distance/near) or follow on-screen prompts (varies by manufacturer).
– For prism verification, ensure the prism mode (or prism display) is enabled if required.
Mark the lens (if supported and required) – Align the lens to the optical center and axis marks per device prompts.
– Apply marks carefully; confirm ink/pins are functioning.
– Remember that marking is a workflow tool and may not be needed in all clinical settings.
Document and repeat – Record results for both lenses and compare to the intended specification when applicable.
– Print/export if part of the SOP.
– Repeat measurements if results conflict with expectations or appear inconsistent.
Close out – Remove spectacles carefully.
– Wipe high-touch points if handling patient eyewear in a shared environment.
– Cover the device when idle to reduce dust.

Practical tips for more stable measurements (without slowing the clinic)

Hold the frame by the temples rather than pressing on the lens surfaces; this reduces smudging and reduces risk of bending the frame.
Avoid lens tilt: even small rocking can change readings, especially for higher prescriptions.
Let the device settle: some models continuously update readings; waiting a second for the values to stabilize can reduce transcription errors.
Measure twice when it matters: a second measurement is fast and can catch misalignment early, particularly for high cylinder axes or prism.
Use consistent lens orientation every time; flipping the lens can change what the device reports depending on settings and lens design.

Measuring progressives: what “distance” and “near” usually mean operationally

Progressive addition lenses (PALs) have multiple powers across the lens surface. Auto lensometers may:

Ask you to find the distance reference area (often near the top portion of the lens).
Prompt you to locate the near reference area (lower portion).
Provide a calculated ADD based on the difference between distance and near measurements.

Operationally, it helps to standardize language in your SOP: for example, document “Distance power measured in the distance zone per device prompt” rather than implying a clinical refraction.

Setup, calibration, and verification (general guidance)

Calibration practices depend heavily on the model:

Some devices support automatic internal checks; others rely on reference lens verification.
Many facilities adopt a routine where a known reference lens is measured at a defined frequency (daily/weekly/monthly) based on risk and volume.
If the device fails verification or drifts outside facility-defined tolerances, stop and escalate to biomedical engineering or authorized service.

Avoid “adjusting until it looks right” unless the manufacturer explicitly provides a controlled user calibration procedure. Uncontrolled adjustments can create hidden systemic errors.

It also helps to distinguish three related terms that are sometimes mixed in daily practice:

Verification check: a quick confirmation that the device reads a known reference lens within tolerance (often done by users).
Calibration: a controlled procedure that sets or corrects device measurement accuracy (often service-only or performed by trained personnel).
Preventive maintenance: cleaning, mechanical inspection, firmware checks, and replacement of wear items to reduce failure risk.

From an audit standpoint, documenting verification checks is usually the most impactful step. From a lifecycle standpoint, having a clear calibration and maintenance plan reduces “silent drift” that can otherwise go unnoticed.

Commissioning and acceptance testing (useful for procurement teams)

When a new Auto lensometer is installed, consider defining acceptance checks such as:

Measures reference/check lens within agreed tolerance and prints/export matches on-screen values.
Prism measurement display and notation match your documentation standard.
Progressive mode can complete a PAL workflow without repeated errors (using a sample lens).
Printer output is legible and includes date/time and device ID if required.
Marking (if used) aligns correctly and produces consistent dot quality.
Network export (if used) functions with your IT security requirements (permissions, authentication, and logging).

Capturing these points in an acceptance form helps protect against installation variability and supports faster troubleshooting later.

Typical settings and what they generally mean

Common configurable items include (names vary by manufacturer):

Cylinder format: plus cylinder vs minus cylinder display
Measurement mode: single vision / bifocal / progressive / contact lens (if supported)
Vertex or reference setting: the device may assume spectacle measurement conventions; contact lens modes differ (varies by manufacturer)
Prism display: on/off and format for base direction
Data output: print layout, patient ID fields, export format, connectivity parameters
Language/units: diopters and axis degrees are standard, but rounding steps vary by device configuration

For standardization across sites, procurement teams often benefit from defining a “default configuration” and locking it via policy or admin access where supported.

Other settings that can affect daily usability include:

Rounding increments: some devices can display in 0.01D, 0.12D, or 0.25D steps. Your SOP should define how values are recorded in the clinical record to avoid “rounding drift.”
Auto-print behavior: auto-print after each measurement can speed workflow in labs but can create paper waste in clinic rooms; selecting the right default matters.
Right/left sequence prompts: some models guide measurement order; aligning this with your staff habits can reduce wrong-eye transcription.
Language and notation options: base direction terminology and prism layout should match your record system to reduce interpretation errors.

How do I keep the patient safe?

Although Auto lensometer usually does not touch the patient, it can still affect safety through infection control and information accuracy. The safest systems treat it as part of the patient record chain, not just an optical gadget.

Safety practices and monitoring

Treat eyewear as a patient-associated item: handle with clean hands/gloves per local policy, and clean/disinfect as appropriate.
Confirm identity before documentation: if readings are entered into records, ensure the right patient context is active.
Use standardized tolerances: define acceptable variation thresholds for verification checks and remake decisions (often based on national/regional standards and facility policy).
Repeat and cross-check when high impact: for unusual readings, high prism, or results that do not match the physical lens appearance, repeat after re-seating and cleaning; consider a second operator check.
Maintain traceability: keep logs of verification checks, faults, and service actions.

Operational safety is often improved by adding simple “error-proofing” steps:

Structured documentation fields: use consistent labels (OD/OS or R/L) and avoid free-text where possible.
Read-back practice: when one staff member measures and another enters into the record, the second person reads values back to confirm correct sign and axis.
Clear triggers for escalation: define what counts as “unusual” (for example, high prism, large axis shift vs prior record, or unexpectedly high ADD) and require a second check.
Separation of tasks during busy clinics: when possible, separate measurement from patient conversation to reduce distractions and wrong-eye entry.

Alarm handling and human factors

Auto lensometer may display error messages rather than audible alarms. Common human-factor risks include rushing, distractions, and inconsistent technique.

Do not ignore recurring error codes—document and escalate.
Avoid “workarounds” that bypass alignment prompts.
Standardize how results are transcribed (including sign conventions and right/left labeling).
Use competency checks for rotating staff and trainees, especially in high-volume clinics.

Human factors improvements that are low-cost but high-impact include:

A “pause point” before saving/printing: a brief check of right/left, plus/minus, and axis can prevent many errors.
Consistent placement of spectacles: always measure right lens first (or always left first) and record immediately, rather than measuring both and trying to remember values.
Minimizing clutter: removing unrelated forms, tools, and devices from the immediate area reduces accidental swaps and improves focus.
Managing interruptions: if interrupted mid-measurement, restarting the measurement rather than continuing “where you left off” reduces wrong-eye entries.

Follow facility protocols and manufacturer guidance

If facility SOPs conflict with the IFU (for example, cleaning chemical choices, calibration frequency, or accessories), the discrepancy should be resolved formally through biomedical engineering/infection control governance. “We’ve always done it this way” is not a defensible safety argument during audits or incident reviews.

For network-connected devices, “manufacturer guidance” can also include software and cybersecurity instructions—who is permitted to update firmware, how accounts are managed, and how audit logs are retained. Even if the device is not directly patient-connected, poor security practices can still create operational risk (loss of records, downtime, or inappropriate access to patient identifiers).

How do I interpret the output?

Auto lensometer outputs are typically straightforward, but interpretation errors are common when teams mix sign conventions, lens types, or measurement zones.

Types of outputs/readings

Most devices display a set of optical parameters such as:

SPH (Sphere): the main lens power, usually in diopters
CYL (Cylinder): astigmatic power component
AXIS: orientation of cylinder (0–180 degrees)
ADD: near addition (for bifocal/progressive lenses)
Prism: magnitude and direction (base up/down/in/out), format varies by manufacturer
Lens type indicator: single vision/bifocal/progressive detection (varies by manufacturer)
Quality/stability indicator: some devices show confidence or alignment status (varies by manufacturer)
Optional transmittance information: UV or other estimates may be available on some models (varies by manufacturer)

Printouts often mirror the on-screen values with time/date stamps and, in some workflows, patient identifiers.

In addition to those core fields, some models may show:

PD or optical center location (especially if the unit is designed for dispensing workflows).
Segment height for bifocals (in dispensing-focused models).
Horizontal and vertical prism components separately, which can be useful for clear documentation and remake communication.
Averaged readings when the device takes multiple samples and calculates a final value.

How clinicians typically interpret them (general)

In clinical operations, readings are commonly used to:

Compare current eyewear against a documented prescription or referral note
Validate that dispensed lenses match the ordered parameters
Establish a baseline lens prescription when patients present with undocumented eyewear
Support optical lab remake decisions and communication with suppliers

Interpretation should remain within the competence of trained staff and local policies. Auto lensometer values are typically one input among others, not a standalone basis for clinical decisions.

For hospital operations, “interpretation” also includes documenting in a way that others can safely reuse. A useful discipline is to document:

The format used (plus or minus cylinder).
Whether the reading is distance or near (for progressives/multifocals).
Any measurement difficulties (scratched lens, heavy wrap, unstable read) that could explain discrepancies later.

Plus-cylinder vs minus-cylinder: why it causes errors

Many prescription systems record astigmatism in minus cylinder format, while some devices or workflows prefer plus cylinder. Both are valid, but mixing them without transposition causes documentation errors.

A simple transposition rule (for trained staff) is:

New Sphere = Sphere + Cylinder
New Cylinder = change sign (plus becomes minus; minus becomes plus)
New Axis = Axis ± 90 degrees (keep within 0–180)

Example (illustrative only):
If the device shows +2.00 / -1.00 x 180, transposed to plus-cylinder becomes +1.00 / +1.00 x 090.

Operational safeguard: decide on one format for your facility records and configure the Auto lensometer to match wherever possible. If not possible, provide a transposition reference and require a second check for transposed entries.

Understanding prism output (documentation clarity)

Prism may be displayed as:

A single value with base direction (e.g., “2.0 Base In”), or
Separate horizontal/vertical components, sometimes with different notation.

Because prism notation varies, many facilities standardize phrasing in their SOPs (for example, always write “BI/BO/BU/BD” or always write “Base In/Base Out/Base Up/Base Down”). Consistent phrasing reduces misunderstanding when communicating with external optical labs or when values are transcribed into different record systems.

Common pitfalls and limitations

Plus/minus cylinder confusion: ensure the device display format matches how your prescription system records values.
Axis entry errors: axis is easy to transpose (e.g., 90 vs 180); double-check right/left and axis.
Progressive lens zone selection: measuring the wrong zone can produce misleading SPH/ADD values.
Dirty or scratched lenses: smears and scratches can cause unstable or incorrect readings.
Lens tilt and frame curvature: poor seating or wrap frames can affect repeatability (varies by manufacturer).
Prism sign conventions: base direction notation must be recorded consistently.
Over-reliance on a single read: if the device output conflicts with physical lens expectations, repeat and verify.

A simple operational safeguard is to require a repeat measurement (or second check) whenever readings are outside expected ranges or will trigger a remake or a significant documentation change.

Additional limitations to keep in mind:

Resolution vs accuracy: a device may display values to two decimal places, but that does not guarantee the reading is accurate to that precision. Local tolerance policies should be based on realistic device performance.
Axis instability at low cylinder: when cylinder power is very small, axis can appear to jump between readings; documenting cylinder as “near zero” with consistent rounding can reduce confusion.
Progressive “ADD” assumptions: some devices infer ADD from near vs distance zones; if the wrong zone is selected, ADD can be misreported.
Lens decentration effects: if the optical center is significantly decentered in the frame, prism readings at the measurement point can differ from expected values if the wrong reference point is used.

A helpful practice is to record notes like “measured at optical center per device” or “PAL distance zone measured per prompt” in workflows where interpretation disputes commonly occur.

What if something goes wrong?

Downtime and measurement uncertainty are predictable realities. A structured troubleshooting approach reduces wasted time and prevents unsafe “guessing.”

Troubleshooting checklist (practical)

Confirm power supply, switch position, and stable outlet grounding
Check the device for obvious damage, spills, or loose cables
Restart the device if frozen; document the event if recurrent
Reduce glare and strong ambient light hitting the measurement area
Clean the lens (both sides) and remove smudges or residue
Re-seat the spectacles to eliminate tilt or rocking
Confirm you selected the correct lens type/mode (single vision vs progressive)
Check the clamp/holder for smooth operation and correct pressure
Verify the reference/check lens reading if your SOP requires it
Replace printer paper or confirm output settings if printing fails
Review any on-screen error codes and follow the IFU guidance
If results vary between repeated reads, attempt a second operator check

Common “symptom patterns” and practical interpretations:

Values change every time you read the same lens: usually alignment/tilt, dirty lens, glare, or a mechanical issue with the clamp.
Axis varies widely but sphere is stable: often low cylinder, unstable seating, or the wrong measurement zone in a progressive.
Prism appears unexpectedly high: confirm you are measuring at the intended reference point and that the frame is not rotated; repeat after reseating.
PAL not detected: try progressive mode manually if available, clean the lens thoroughly, and ensure you are not measuring too close to the edge.

When to stop use

Stop using the Auto lensometer and escalate if:

The device fails verification checks and you cannot resolve it per IFU
Readings are consistently unstable across multiple lenses
Mechanical parts jam, scrape, or appear misaligned
There is smoke, burning smell, unusual heat, or signs of electrical fault
Liquid ingress is suspected
The screen/control interface becomes unreliable in a way that risks data entry errors

A useful operational safety step is to physically label the unit “out of service” and remove it from the workflow area if possible. Leaving a faulty device in place increases the chance someone will use it “just once,” creating undocumented risk.

When to escalate to biomedical engineering or the manufacturer

Escalate to biomedical engineering when issues involve electrical safety, repeated failure, verification drift, or suspected mechanical misalignment. Escalate to the manufacturer (or authorized service partner) when the IFU indicates service-only actions, parts replacement, software faults, or when warranty terms require authorized intervention.

For operations leaders, it is worth defining a downtime plan:

Manual lensometer backup (if available)
Referral to optical lab partner during outages
Clear labeling: “out of service” tags and lockout procedures
Incident documentation and trend review for recurrent faults

Additional lifecycle practices that reduce disruption:

Stock critical consumables and wear items: printer paper, marking ink, and any user-replaceable parts.
Define a loaner policy with the vendor: some distributors can provide a temporary unit during repair if contracted.
Schedule preventive maintenance outside peak clinic hours: align service windows with lower patient volume where possible.
Trend error types: repeated “unstable reading” reports may indicate training gaps, while repeated “printer fault” reports may indicate a hardware issue.

Infection control and cleaning of Auto lensometer

Auto lensometer is not typically a sterile clinical device, but it can become a high-touch contamination point because it frequently contacts patient eyewear and staff hands.

In many facilities, the bigger infection-control risk is not the device optics, but the workflow around it: patient spectacles move from face to hands to lensometer to desk surfaces. A simple “clean hands + clean eyewear + clean device surfaces” discipline can significantly reduce contamination.

Cleaning principles

Cleaning first: remove visible soil (fingerprints, cosmetics, dust) before disinfection.
Use compatible products: disinfectants and wipes must be approved by your facility and compatible with device materials; incompatible chemicals can craze plastics or damage coatings (varies by manufacturer).
Avoid fluid ingress: liquids entering the optical path or electronics can cause failure and inaccurate readings.
Do not sterilize unless specified: sterilization is generally not applicable for this hospital equipment; follow IFU for any exceptions.

A practical operational tip is to avoid “spray and wipe” directly on the device. Instead, apply product to a wipe (as permitted by your policy) and then wipe the surface, reducing the risk of fluid getting into seams or the optical chamber.

Disinfection vs. sterilization (general)

Cleaning: physical removal of dirt and organic material.
Disinfection: reduction of microorganisms on surfaces using chemicals with defined contact times.
Sterilization: elimination of all microbial life, typically not used for this type of medical equipment.

Your infection control team should define whether cleaning between patients is required based on local risk assessment and outbreak status.

Where between-patient cleaning is required, consider workflow adjustments to maintain throughput (for example, having a small “cleaning pause” built into intake, or using two workstations so one can dry while the other is in use).

High-touch points to focus on

Lens table/rest and any frame contact surfaces
Clamp/holder contact points
Joystick or alignment controls
Keypad/touchscreen and confirmation buttons
Printer door/button and paper exit area
Power switch and frequently handled side panels

Also consider nearby surfaces that are frequently touched during measurement:

The immediate benchtop area where spectacles are placed.
Any shared pens, clipboards, or labels used to record or attach printouts.
The waste bin area if printouts with identifiers are disposed of (privacy and infection control can intersect here).

Example cleaning workflow (non-brand-specific)

Perform hand hygiene and don gloves if required by policy.
Power down or place the device in a safe idle state if the IFU recommends it for cleaning.
Remove dust with a dry lint-free cloth (avoid pushing debris into crevices).
Wipe high-touch areas with an approved disinfectant wipe; do not oversaturate.
Respect disinfectant contact time per product instructions.
Dry any residual moisture with a clean lint-free cloth if needed.
Clean spectacles per your eyewear handling SOP (separately from the device).
Dispose of wipes appropriately and perform hand hygiene.
Document cleaning if required (especially in high-risk areas or during outbreaks).

If you use lens marking ink, incorporate it into the cleaning plan. Ink residue on the lens table or marking pins can transfer to staff gloves or other surfaces; cleaning and periodic inspection help prevent build-up and maintain consistent marking quality.

Medical Device Companies & OEMs

Procurement and service outcomes depend not only on the brand on the front panel, but also on who designed, manufactured, and supports the unit over its lifecycle.

In ophthalmic diagnostics, “device performance” is not only about measurement specs on paper. It is also about:

Software stability over time,
Availability of service parts and consumables,
Local technical support competence,
Clear documentation and training resources,
Predictable product lifecycle (how long the model is supported).

Manufacturer vs. OEM (Original Equipment Manufacturer)

Manufacturer (brand owner): the company that markets the product, holds regulatory responsibility in many jurisdictions, and typically manages labeling, IFU, and warranty terms.
OEM: a company that produces components or complete devices that may be rebranded and sold by another company.

In some markets, an Auto lensometer sold under a local label may be OEM-built. This is not inherently good or bad, but it changes how you should assess:

Regulatory documentation and responsibility (varies by country)
Software update pathways and cybersecurity posture (if networked)
Availability of spare parts and consumables
Service training and authorization requirements
Longevity of product line and backward compatibility

For buyers, a practical question is: “Who will still be able to service this unit in 7–10 years?” The answer is often more important than minor feature differences.

Additional due-diligence questions that help procurement teams avoid surprises:

Does the vendor provide service manuals or only user manuals?
Are spare parts available locally, or must they be imported per incident?
Are consumables (paper, ink, marking pins) proprietary or generic?
Does the device rely on software licenses that expire or require renewal?
If networked, can the device operate safely offline if the network is down?
What is the manufacturer’s policy for end-of-life (EOL) and end-of-support (EOS) timelines?

Top 5 World Best Medical Device Companies / Manufacturers

The following are example industry leaders in global medical devices and hospital equipment. This is not a ranked list, and these companies may not manufacture Auto lensometer products specifically (availability and portfolio vary by manufacturer).

Medtronic
Medtronic is widely recognized for a broad portfolio of implantable and interventional medical devices. Its global footprint and mature quality systems influence how many hospitals evaluate supplier stability. Support models, service coverage, and procurement channels vary by country.
Johnson & Johnson (MedTech)
Johnson & Johnson operates across multiple healthcare segments, including medical devices and vision-related categories. Many systems view the organization as a long-established multinational supplier with structured compliance and post-market processes. Specific product availability depends on region and business unit.
Siemens Healthineers
Siemens Healthineers is known for large-scale diagnostic and imaging platforms and related service ecosystems. From a hospital operations standpoint, its reputation often centers on enterprise support capabilities and long-term servicing models. Product lines and local support capacity vary by market.
GE HealthCare
GE HealthCare is associated with imaging, monitoring, and digital/clinical workflow tools in many regions. Large organizations like this can offer standardized service programs, but contract terms and responsiveness vary by geography and distributor structure. Always confirm local service SLAs during procurement.
Philips
Philips is a long-established supplier in patient monitoring, imaging, and hospital systems in many countries. Buyers often consider its scale, training resources, and installed base when planning lifecycle management. As with other multinationals, portfolio focus and support depend on the local operating company.

Notable ophthalmic/optical instrument manufacturers often associated with lensometers (examples)

Because Auto lensometers sit within ophthalmic diagnostics and optical dispensing, many buyers also evaluate companies that focus specifically on eye-care instrumentation. The following are examples of manufacturers that are commonly associated with lensometer-style products or related ophthalmic/optical diagnostic equipment (availability and product naming vary by region and over time):

NIDEK
Topcon
Huvitz
Reichert
EssilorLuxottica (optical equipment and dispensing ecosystem; specific offerings vary)
Marco (often distributor/rebranded offerings depending on market)
Righton
Takagi

This list is not exhaustive and not ranked. The operational point is to confirm current product support, local service capability, and the specific model’s performance in your lens mix (single vision, high cylinder, high prism, PALs).

Vendors, Suppliers, and Distributors

Auto lensometer procurement often fails or succeeds based on the channel partner: who sells it, who installs it, who trains users, and who responds when it fails.

A technically strong device can still become a poor investment if the distributor cannot provide timely service, spare parts, or credible training. Conversely, a mid-range device can perform very well in a hospital if it is supported by strong commissioning, configuration standardization, and responsive maintenance.

Role differences between vendor, supplier, and distributor

Vendor: the entity that sells to your facility; may be a manufacturer, distributor, or reseller.
Supplier: a broader term for any organization providing goods/services (device, consumables, service contracts, calibration).
Distributor: typically buys from manufacturers and sells to end users, often handling importation, warehousing, and local compliance.

For many ophthalmic diagnostic devices, the distributor is also the practical service partner. Procurement should therefore evaluate the distributor’s service capability as seriously as the device specification.

Practical procurement questions to ask the vendor/distributor include:

Who performs installation and user training (in-house staff vs subcontractor)?
What is the response time for faults, and is it guaranteed in writing?
Are spare parts stocked in-country, and which parts are considered “fast moving”?
Does the vendor offer a preventive maintenance plan and verification support?
Are software updates included, and how are they delivered and validated?
What consumables are required, and what is the typical lead time?

Top 5 World Best Vendors / Suppliers / Distributors

The following are example global distributors across healthcare supply. This is not a ranked list, and not all of these organizations distribute Auto lensometer in every country (varies by region and authorization).

Henry Schein
Henry Schein is widely known as a distributor serving clinic and office-based care environments in multiple regions. Buyers often engage such distributors for bundled purchasing, logistics support, and service coordination. Specific ophthalmic device availability depends on the local catalog and authorized partnerships.
McKesson
McKesson is a major healthcare supply and distribution organization, particularly prominent in North America. Its strengths often relate to logistics scale and contract-based procurement. Medical equipment distribution scope varies by business unit and geography.
Cardinal Health
Cardinal Health is recognized for large-scale healthcare distribution and supply chain services. Many facilities interact with such organizations for standardized purchasing and inventory programs. The availability of specialized clinical devices depends on local offerings and manufacturer authorizations.
Medline Industries
Medline is known for broad hospital supply portfolios and value-added logistics services in many markets. Procurement teams may use Medline-style partners for consistent delivery and product standardization. Specialized diagnostic equipment coverage varies by region.
DKSH
DKSH is known for market expansion and distribution services in parts of Asia and other regions. For hospitals, this type of partner can be relevant where importation, regulatory navigation, and local service coordination are critical. Product scope varies by country and manufacturer relationships.

What “good” looks like in a distributor relationship

In day-to-day operations, strong distributors typically provide:

Clear escalation channels (user support → technical support → field service).
Documented commissioning steps (configuration, verification, acceptance sign-off).
Training that includes not only “how to push the buttons” but how to avoid common errors.
Predictable spare-part pathways and transparent repair pricing.
Service documentation that your biomedical engineering team can store for audits.

These factors often matter more than small differences in measurement speed or screen size.

Global Market Snapshot by Country

India

Demand for Auto lensometer is supported by high patient volumes, growing optical retail, and expanding eye-care networks in major cities. Many facilities rely on imported medical equipment, while service quality can vary between metropolitan hubs and smaller districts, influencing uptime and calibration planning. Procurement in larger organizations may be tender-driven, making training commitments and service SLAs key differentiators between otherwise similar devices.

China

China’s market combines large urban hospital systems with a sizable optical retail and manufacturing ecosystem. Import dependence varies by segment, and buyers often evaluate local service capacity and parts availability alongside device features, especially outside tier-one cities. Multi-site health systems may prioritize standardized configurations and multilingual documentation to support consistent staff workflows.

United States

Auto lensometer demand is driven by outpatient eye care, optical dispensing, and quality-control expectations in regulated environments. Procurement often emphasizes service contracts, traceable verification processes, and integration needs, with strong distributor/service networks in most regions. In many settings, the expectation for audit-ready documentation increases the value of reliable printing/export and consistent device configuration control.

Indonesia

Growth is linked to urban clinic expansion and increasing access to refractive services, while rural and island geographies can constrain maintenance responsiveness. Many buyers depend on imported clinical devices, so authorized service coverage and spare-part lead times are key purchasing considerations. Remote support capability and straightforward user verification routines can be especially valuable where onsite technical visits are delayed.

Pakistan

Demand is concentrated in urban centers where eye clinics and optical services are more developed. Import dependence is common, and variability in local service ecosystems makes training, warranty clarity, and access to calibration support especially important. Buyers often look for rugged devices that tolerate busy workflows and have readily available consumables.

Nigeria

Urban demand is supported by private clinics and expanding diagnostic services, while access outside major cities can be limited by infrastructure and service availability. Importation is typical for hospital equipment in this category, so distributor strength and parts logistics heavily influence lifecycle cost. Facilities may benefit from choosing models with simple daily verification practices and strong local training support.

Brazil

Brazil has a mix of public and private demand, with stronger service ecosystems in large metropolitan areas. Import procedures and regional distribution complexity can affect procurement timelines, making local support capability and in-country technical coverage important evaluation points. Larger networks may focus on standardizing device models across sites to simplify training and spare-part stocking.

Bangladesh

High population density supports demand in major cities, with a strong focus on value and durable operation. Many facilities rely on imports and prioritize vendor training, warranty terms, and practical service response due to limited specialized support in some areas. Devices with stable performance on a wide range of lens conditions (scratches, coatings, dust exposure) can be preferred in high-throughput environments.

Russia

Demand is concentrated in larger urban medical centers and private optical services, with procurement influenced by import pathways and availability of authorized service. Service continuity and spare-part access can be a major operational driver, particularly for networked or software-dependent models. Facilities often evaluate whether the device can remain functional with minimal software changes if update pathways are constrained.

Mexico

Mexico’s market is supported by urban private providers and hospital outpatient services, with variable access in rural regions. Import dependence is common, and buyers frequently evaluate distributor installation, training, and post-sale support as part of total cost of ownership. Standardized printouts and consistent documentation practices can help reduce remake disputes when multiple suppliers are involved.

Ethiopia

Demand is growing in urban hospitals and eye programs, while rural access remains constrained by workforce and infrastructure. Imported medical equipment is typical, and procurement often prioritizes robustness, simple verification routines, and dependable local service partners. In program settings, ease of training and clarity of the IFU can be as important as advanced features.

Japan

Japan’s market is characterized by high expectations for precision, workflow efficiency, and preventative maintenance discipline. Service ecosystems are generally well developed, and buyers often emphasize reliability, traceability, and long-term support for clinical device fleets. Standardized process documentation and consistent calibration practices are commonly expected as part of quality management culture.

Philippines

Demand is strongest in urban centers where private clinics and hospitals expand diagnostic capacity. Island geography can affect service response times, so procurement commonly weighs distributor network coverage, spare parts availability, and remote support options. Facilities may prefer models with straightforward user verification steps and strong durability for frequent transport between rooms or sites.

Egypt

Urban healthcare investment and private optical services support demand, with many facilities sourcing imported hospital equipment. Service capability can vary by distributor, making commissioning, user training, and verification routines critical for stable operations. In multi-clinic organizations, consistent cylinder-format configuration and standardized printouts can reduce documentation variability.

Democratic Republic of the Congo

Demand is primarily urban and program-driven, with significant constraints in logistics and technical support outside major centers. Import dependence is typical, so buyers often prioritize ruggedness, straightforward operation, and a realistic service plan for maintenance and repairs. Devices that function reliably with minimal consumables and simple cleaning routines may be preferred where supply chains are challenging.

Vietnam

Vietnam shows growing demand linked to urban clinic expansion and increasing optical services. Many Auto lensometer units are imported, and procurement decisions commonly consider distributor training quality and long-term service support as the market diversifies. Facilities may also value devices with clear progressive-lens prompts to reduce staff variability as service volumes increase.

Iran

Demand is influenced by local healthcare investment and the availability of import channels and service support. Facilities often focus on maintainability and parts access, with service ecosystems varying by city and by supplier capability. Clear warranty terms and stable consumable availability can be decisive factors for long-term operation.

Turkey

Turkey’s market combines public and private demand with strong activity in major cities. Import dependence exists but is balanced by an established distribution landscape in many areas; procurement often centers on warranty clarity, local technical coverage, and turnaround times. Larger providers may standardize equipment across sites to simplify training and improve measurement consistency.

Germany

Germany’s demand is supported by mature outpatient services and high expectations for quality systems and documentation. Buyers commonly emphasize compliance-aligned processes, routine verification, and dependable service infrastructure, with strong urban coverage and structured procurement pathways. Integration with documentation workflows and predictable maintenance support are often considered part of the total value proposition.

Thailand

Demand is driven by urban hospital growth, private clinics, and optical services, with regional variability in service access. Imported medical equipment is common, and procurement teams often prioritize distributor support, training, and practical uptime planning for multi-site operations. Devices that provide stable readings for progressives and clear documentation outputs can reduce remake rates in busy dispensing environments.

Key Takeaways and Practical Checklist for Auto lensometer

Define whether your use case is documentation, QC verification, or both.
Treat Auto lensometer as a workflow-critical clinical device, not a gadget.
Standardize cylinder format (plus/minus) across sites and records.
Train users on SPH/CYL/AX, prism notation, and right/left labeling.
Use a stable bench, controlled lighting, and good cable management.
Keep the IFU accessible at the point of use.
Perform routine verification with a reference lens per local policy.
Document verification checks in a log or CMMS for audit readiness.
Clean patient eyewear before measurement to improve stability.
Re-seat the frame if readings fluctuate or look inconsistent.
Select the correct lens mode, especially for progressive lenses.
Avoid forcing readings when the device shows repeated errors.
Repeat measurements when results will trigger a remake or escalation.
Use a second operator check for unusual prism or high-power readings.
Confirm identity before attaching results to a patient record.
Protect patient privacy if printing or exporting measurements.
Keep high-touch points disinfected according to facility policy.
Avoid chemicals that may damage plastics or optics; follow IFU.
Prevent fluid ingress; never spray liquids directly onto the device.
Keep marking systems maintained if your workflow requires lens marking.
Stock consumables (paper, ink) to avoid “workarounds” and delays.
Plan downtime coverage (manual lensometer backup or referral pathway).
Tag and remove from service any device that fails verification checks.
Escalate electrical faults immediately to biomedical engineering.
Verify that your vendor can provide parts and service for years.
Confirm whether the seller is an authorized distributor for your region.
Include installation, training, and acceptance testing in procurement scope.
Define acceptance criteria during commissioning (functions, printouts, modes).
Review software update policies if the device is network-connected.
Align cleaning steps with infection control and biomedical engineering guidance.
Standardize how results are transcribed to avoid transcription errors.
Use consistent naming for prism base direction in documentation.
Store the device covered to reduce dust and cleaning burden.
Trend failures and service calls to identify training or maintenance gaps.
Reassess workflows when staffing changes increase measurement variability.

Additional practical actions that often improve reliability and reduce rework:

Define a simple rounding rule for documentation (especially if the device displays finer increments than your record system).
Keep a transposition quick guide available if plus/minus cylinder conversion is ever required.
Use a clear method to label readings as distance vs near for progressive lenses in records and printouts.
Standardize whether printouts are filed, scanned, or destroyed, and ensure disposal follows privacy policy.
During commissioning, document the device’s default settings (format, modes, printer layout) so they can be restored after service or software changes.
Consider periodic inter-operator comparison checks (two users measure the same lens) to identify training needs early.

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