Visual Acuity
Software.

The Checklist

1 · Calibration you can physically verify.

The single question that separates clinical software from a letters app: how does it know how big a millimeter is on this screen? Software that trusts the display's self-reported dimensions inherits every manufacturer's rounding error. Ocular Edge calibrates each lane against a physical ruler held to the glass, computes letter sizes from the measured testing distance, and invites you to verify the result — a 20/20 letter must measure exactly 8.87 mm at 20 feet, and on a calibrated lane, it does.

2 · Optotypes drawn as geometry, not fonts.

A font rendering of "C" is typography; a Landolt C is a specification. Acuity software should draw its optotypes as vector paths with the proportions the standards define — ETDRS letter conventions, the ISO 8596 ring — so a Sloan letter has identical stroke geometry on a Fire TV stick, a Samsung panel, and a laptop. Ocular Edge renders every optotype in all 20 chart types this way.

3 · Scoring that matches the literature.

If you record LogMAR, the software should score like the studies do: five letters per ETDRS row, constant 0.1 logMAR steps, per-letter credit at −0.02 logMAR. Snellen equivalents should be computed, not eyeballed. Ocular Edge scores both, per eye — OD, OS, OU — with results summarized at the end of every run.

4 · Randomization, isolation, and crowding.

Paper's fatal flaw is that patients memorize it. Software's advantage is that it never repeats: fresh random lines from the standard letter sets on every press, single-optotype isolation for amblyopia work, crowding bars for pediatric protocols, and column and multi-row presentations when the workup calls for them. If a package can't randomize, it's a photograph of a chart.

5 · Control from the exam stool.

Exams run at the phoropter, not at a keyboard tray. The software should answer to a remote: number keys launching charts, arrows walking lines, one-key eye cycling and mirror toggling. Ocular Edge maps any infrared remote through a FLIRC USB adapter — with every binding reassignable in a built-in remote mapper — and Fire TV lanes use the remote already in the room.

6 · Platform freedom, offline resilience.

Software that requires a dedicated Windows PC per lane is an appliance with extra steps. Demand the browser: Chrome, Edge, Safari, Firefox on any TV, monitor, or tablet, plus native apps where they help (Amazon Fire TV today). And demand offline behavior — Ocular Edge lanes keep testing through a dropped connection, because the charts run locally once loaded.

7 · A price you can read before a rep calls.

Dealer-quoted chart hardware commonly lands between $2,600 and $4,200 per lane. Whatever software you choose, it should publish its price. Ours: $24.99 per lane per month, $449 once for a lifetime lane license, Enterprise at $225/month for up to 20 lanes with every add-on — and a free trial before any of it.

Where software simply wins.

Meeting the checklist makes software equal to the appliance. What makes it better is everything the appliance can't do: the same platform runs your branded waiting room channel — promotion decks, live patient reviews, weather, health tips — and AI tools that draft slides, social posts, and billing-code answers for the front desk. New features arrive in the next release on every screen you own, not in the next hardware generation on a purchase order.

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