Free eye charts for any screen
Free online eye test chart calibrated to your screen.
Measure your monitor once, enter the viewing distance, and TestingChart draws each line at its true angular size in Snellen, decimal or LogMAR.
- 15tests in one menu
- 5′optotype at 6/6
- 0.1logMAR per line
- 0sign-ups or installs
What's included
Fifteen tests, one menu.
Acuity charts share one size scale, so moving a patient from letters to pictures keeps them on the same line.
Accuracy
Sized from your screen and your distance.
- Measure the screen
Match a bank card on screen, measure a 100 mm bar, or enter the diagonal.
- Set the viewing distance
0.3 m to 40 ft. Mirror rooms use the full optical path.
- Test
A 6/6 letter is 5 arcminutes tall at the eye, with 1-arcminute strokes.
| Snellen 6 m | 20 ft | Decimal | LogMAR | VE % | Height mm | Pixels |
|---|
Controls
Run it from across the room.
A wireless keyboard or presenter remote works out of the box. Save named programs, such as letters then duochrome then cross-cyl, and step through them with the arrow keys. With a free account, your programs follow you to any screen.
Ready when you are
Turn the screen in front of you into a test chart.
A screening and teaching tool, not a medical device. It does not replace an examination by an optometrist or ophthalmologist. Accuracy depends on calibration, browser zoom at 100% and a measured distance. Screen colour and contrast vary, so colour vision and contrast results are a guide only.