Everything AcuityMaster does.

Units of Measure

Switch between all popular visual acuity formats instantly — no setup required between patients.

• US Snellen — 20/400 … 20/20
• Metric — 6/60 … 6/6
• LogMAR — 1.0 through 0.0 (ETDRS standard)
• Decimal — 0.1 through 1.0

Calibration

Configure AcuityMaster once for your exam lane — settings persist between sessions.

• Unit of measure selection (US, Metric, LogMAR, Decimal)
• Patient-to-screen distance in feet or meters
• Letter size auto-calculated from entered distance
• Pediatric fixation video clip selection

Chart Types

Every specialist test in one application — no switching software between exam types.

• Snellen — the universal standard acuity chart
• ETDRS / LogMAR — 5 letters per row, equal spacing, gold standard for clinical trials
• Worth 4-Dot — color-correct, calibrated for binocular testing
• Astigmatic Dial — sunburst target for cylinder axis estimation
• Fixation Disparity — binocular balance and vergence testing
• Reduced-contrast acuity — four optotype contrast levels (25/50/75/100%)

Optotypes

Standardized visual symbols used to measure visual acuity, including letters, numbers, geometric shapes, and directional figures. AcuityMaster offers:

• Letter optotypes — 20-letter set
• Tumbling E — patient indicates direction of prongs; no letter knowledge required
• Landolt C — ISO 8596 standard broken-ring optotype
• HOTV — four-letter matching chart for pre-literate children (ages 2.5+)
• Picture optotypes — apple, cake, car, chicken, hand, horse, phone, umbrella; designed for young children

Display Mode

Switch display mode instantly without leaving the chart — no reconfiguration needed between patients.

• Single Letter — isolates one optotype to eliminate the crowding effect; particularly useful for amblyopia testing
• Single Line — displays one complete acuity line at a time
• Multiline — full chart view in traditional Snellen format

Pediatric Friendly

AcuityMaster is designed with pediatric patients in mind. Picture optotypes feature objects children actually recognize today — including a cell phone, because today’s kids no longer know the rotary telephone.

• Picture optotypes (apple, cake, car, chicken, hand, horse, phone, umbrella)
• HOTV matching cards for children aged 2.5 and up
• Hands-free video fixation via keyboard or USB foot pedal
• Tumbling E and Landolt C for pre-literate patients

See the Accessories page for the compatible USB foot pedal.

Options

Tailor each exam without switching applications or reconfiguring your setup.

• Mirror mode — display behind the patient via a mirror for compact exam lanes; software flips the chart automatically. Also supports standard front-facing display.
• Toggle 20/XX label — show or hide the acuity notation on the patient-facing display.
• Crowding bars — add surrounding optotypes to isolate the crowding effect; essential for amblyopia assessment.
• Reduced contrast — four optotype contrast levels (25/50/75/100%).
• Red/Green overlay — for binocular balance and duochrome refraction.

Color Vision

Color vision screening is integrated directly into your exam workflow — no separate application or hardware required.

• Color vision screening plates on your exam-lane display
• Screen for red-green (protan and deutan) color deficiency
• One click from acuity testing to color vision — no workflow interruption
• Color reproduction depends on your monitor and room lighting — treat plate results as screening
• 8% of males have some color vision deficiency — efficient screening matters

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Special Features

Practical features built around real exam-lane workflows — especially useful for dual-monitor setups and pediatric patients.

• Second-monitor support — run the chart full-screen on whichever display the browser is on; press H to hide the menu.
• Mirror Mode — chart displayed behind the patient via a mirror; software flips automatically for correct reading.
• Single-letter isolation — present one optotype at a time to remove crowding cues.
• Runs on existing hardware — Mac, Windows or iPad, in any current browser. Use the computer already in your exam lane.