Resources

Visual Acuity Testing — Clinical Guides

Practical articles on visual acuity testing, digital eye charts, and ophthalmic workflow — written by Mark S. Brown, MD, oculoplastic surgeon and founder of AcuityMaster.

Clinical Guide

Snellen vs. ETDRS: When to Use Each in Clinical Practice

Snellen and ETDRS both measure visual acuity, but they are not interchangeable. When each applies, how to convert, and why ETDRS is required for retinal monitoring and clinical trials.

By Mark S. Brown, MD

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Setup Guide

How to Set Up a Digital Eye Chart System in Your Exam Lane

A step-by-step guide to replacing your projector: monitor selection, dual-display configuration, patient distance calibration, and ANSI Z80.21 luminance compliance.

By Mark S. Brown, MD

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Clinical Guide

Pediatric Optotypes: Choosing the Right Chart for Young Patients

Lea Symbols, HOTV, Tumbling E, Landolt C — each has a specific use case and age range. How to select the right chart for every pediatric patient.

By Mark S. Brown, MD

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Workflow

Digital Eye Chart vs. Projector: What the Math Actually Shows

The hidden costs of bulbs, warm-up, and limited chart types add up. A data-driven comparison of cost and clinical capability over a five-year horizon.

By Mark S. Brown, MD

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Written from the exam lane

Each article is written by Dr. Mark S. Brown, MD, drawing on 25+ years of clinical practice in ophthalmology. More guides are added regularly.

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