Tumbling-E chart · screen-calibrated

👁️ Visual Acuity Test

A screen-calibrated tumbling-E acuity test. Calibrate your display against a bank card, set your viewing distance, then a letter E is drawn at the exact physical size for each Snellen line — press the direction its arms point. Reading three of five drops you to a smaller line; your result is given as 20/D, decimal and logMAR. For reference only, not a substitute for a real eye exam.

1) Place a real bank/credit card on the screen and drag the slider until the blue box matches its width exactly.

Bề ngang thẻ — hiệu chỉnh (hiện 0 px/mm)

2) Khoảng cách ngồi: 2.0 m — hãy ngồi cách màn hình đúng khoảng này.

Press the arrow (or your keyboard arrow keys) matching the direction the E's three arms point. Good lighting and correct distance matter. Results are indicative only — see an optometrist for a real diagnosis.