Sharpness

VISUAL
ACUITY
TEST

A real tumbling-E eye chart, in your browser, with letters rendered true to size — you calibrate the screen with a bank card first, so a "20/20 letter" genuinely subtends 5 arc-minutes at your distance. Tell us which way each E points until they get too small.

How it works

1
Calibrate with any bank card
Every card on Earth is 85.6 mm wide — that's our ruler.
2
Step back & measure your distance
Farther is better — 100+ cm lets the test measure sharper vision.
3
One eye at a time
Cover the other with your palm. Wear your usual glasses/contacts — the result reflects your corrected vision.
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Step 1 of 2

CARD
CALIBRATION

Hold any standard card (credit, debit, ID, library) flat against the screen and drag the slider until the box is exactly as wide as the card.

MATCH THIS BOX
TO YOUR CARD'S WIDTH
Smaller Larger
Box: 320 px → screen scale pending
Measure or pace it out — accuracy here directly scales your result. 100–200 cm recommended.
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LEVEL 20/200RIGHT EYE

Which way do the prongs of the E point?

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Eye complete

NOW
LEFT
EYE

Right eye done. Cover your right eye with your palm, keep the same distance, and continue.

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Results

YOUR
ACUITY

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Note
This estimates the acuity of your vision as it is right now (with whatever correction you're wearing) at the distance you entered. It is not a refraction and cannot produce a prescription — that requires an optometrist with controlled optics. Card calibration makes letter sizes honest, but lighting, screen sharpness, and distance-measuring error all move the result. If this test suggests your vision is worse than you expected, that's a reason to book an eye exam, not a diagnosis.