What is it?
The Eye Test Chart is a letter chart, sized for your screen, for a rough check of distance vision at home. It has a classic Snellen-style chart and a tumbling E chart for people who can’t read letters. It does not replace an eye test by an optician.
Who is it for?
Adults doing a quick check, parents screening children (tumbling E works before they can read), and teachers running class screenings.
How to use it
- Size the chart to your screen (once): Hold any bank or ID card against the box and move the slider until the box is exactly as wide as the card.
- Set Your distance from the screen and Units, and stand there.
- Cover one eye and read the smallest line you can; repeat for the other eye. New letters prevents memorising.
Reading the result
6/6 (20/20) means you see at 6 metres what a typical eye sees at 6 metres. If you can’t read the 6/9 line, or eyes differ by two lines or more, see an optometrist.
Not a medical test. It’s a quick screening aid; see an optometrist, audiologist or doctor for a proper check, especially if you notice changes.
Errors and how to fix them
- Results seem wrong: the chart must be calibrated with the card, browser zoom at 100%, and you at the exact distance.
- Glasses: test with your glasses on to check your current prescription.
Open the tool: Eye Test Chart
Still stuck?
Contact support. Tell us which tool or page you were using, what you tapped, what you saw, and your phone or computer and browser (for example: Android phone, Chrome). We reply by email.
Questions, or an error not listed here?
Tell us in the comments: what you were doing, the exact message you saw, and your device and browser. We read every comment and add new fixes to this article.