Tumbling-E chart · screen-calibrated

👁️ Visual Acuity Test

A tumbling-E acuity test calibrated to your screen: each Snellen line is drawn at its exact physical size, and the result comes out as 20/D, decimal and logMAR.

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 để hiệu chỉnh (hiện 0 px/mm)

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

Calibrate the display against a bank card, then set your viewing distance. Reading three of five drops you to a smaller line. 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.