Test Your Eyesight with an Online Eye Chart
Check distance vision with on-screen charts-calibrate size, then test at the recommended distance.
Eye Test Chart
Visual acuity measurement: 20/20
Chart Type
Screen Size Calibration
Adjust the slider until the ruler above measures exactly 10 cm (100 mm).
The usual reference distance for Snellen charts is 20 feet (6 meters). For home use, stand at least 10 feet (3 meters) from the screen.
For more reliable results, test one eye at a time (cover the other eye).
These charts are sourced online for general information only. Accuracy is not guaranteed. For a professional exam, see an eye care specialist.
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How to Use the Online Eye Test Chart
- Sit 10–20 feet (3–6 meters) from the screen, depending on your setup
- Use the calibration ruler so the on-screen scale matches real size
- Test one eye at a time (cover the other eye with your hand or a card)
- Read from the top row downward
- The smallest row you read correctly indicates your approximate visual acuity
- Use Print for a layout suited to paper
Important Notes
- This tool is not a substitute for a professional eye examination
- If smaller rows are hard to read, consult an eye care professional
- Use good lighting and comfortable screen brightness
- The calibration ruler helps match the chart to the correct physical size
- Picture charts help young children who cannot read letters
- The Tumbling E chart helps people who do not use Latin letters
Understanding Visual Acuity (general information)
- 20/20 is often described as “normal” distance acuity in the US notation
- 20/40 means at 20 ft you see what someone with typical acuity sees at 40 ft
- Legal blindness thresholds differ by region and context-ask a professional
- If results suggest reduced acuity, book an optometrist or ophthalmologist