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Vision Test

Quick online visual acuity test

Before you start: Sit about 50–60 cm (20 inches) from your screen. Make sure your screen is at full brightness. Remove glasses only if you are testing uncorrected vision.

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About This Calculator

This informal vision screening tool lets you check your visual acuity at home using a Snellen-style letter chart displayed on your screen. The test presents letters at five decreasing size levels and asks you to identify them, giving you a rough sense of how sharp your distance vision is. It is a fun and educational way to gauge your eyesight between professional eye exams. This is not a medical test and cannot diagnose eye conditions, measure your prescription, or detect diseases. Screen size, brightness, resolution, and your viewing distance all affect the results, so treat it as an informal check rather than a clinical measurement. For an accurate assessment, visit an optometrist or ophthalmologist.

How to Use

1
Set up your screen
Position yourself at a comfortable distance from your display.
2
Identify the letters
Read the letters displayed at five decreasing size levels.
3
View your results
See your approximate acuity result. Visit an eye care professional for a proper exam.

Frequently Asked Questions

Q. Can this online vision test replace an eye exam?

No. This is an informal screening tool only and cannot replace a professional eye examination. It does not test for glaucoma, cataracts, retinal diseases, or provide an accurate prescription. Use it as a casual check between regular optometrist visits.

Q. What does the test measure?

The test displays letters at five different size levels, similar to a Snellen eye chart. You identify letters at each level to get a rough sense of your visual acuity (how clearly you can see at a distance). Smaller letters that you can read correctly suggest better acuity.

Q. How should I take the test for the best results?

Sit at a comfortable distance from your screen (about an arm's length), ensure the room is well-lit without glare on the screen, and set your screen brightness to a normal level. Keep in mind that results are approximate and depend on your screen size and resolution.

Q. How often should I get my eyes checked by a professional?

Adults aged 18-60 with no known issues should have a comprehensive eye exam every two years. Those over 60, diabetics, and people with a family history of eye disease should go annually. This online tool is not a substitute for those visits.

Disclaimer: Results are for informational purposes only and do not constitute professional advice. Always consult qualified professionals for important decisions.

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