Vision & Eye Chart Screen Test
Self-check your vision with a calibrated Snellen acuity chart and Amsler grid on your screen. Per-pixel calibration, instant results, free and offline.
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What is Vision & Eye Chart Screen Test?
Vision & Eye Chart Screen Test brings a calibrated Snellen acuity chart and Amsler grid to your browser. After calibrating to your screen size and viewing distance, letter sizes are physically accurate, enabling a genuine self-screening from 20/200 to 20/20 - plus an Amsler grid for central vision and macular health.
Key Benefits
- Quick vision check without visiting a clinic
- Physically accurate letter sizes via per-pixel calibration
- Amsler grid screens for macular issues standard charts miss
- Instant acuity verdict with clear professional-care guidance
- No camera, no upload, no installation - browser only
Common Use Cases
- •Checking whether your prescription is still adequate between exams
- •Screening family members who cannot visit an optometrist easily
- •Monitoring vision changes after starting new medication
- •Setting up a vision-screening station in a school or workplace
How to Test Your Vision on Screen
- Calibrate the chart: Enter your screen diagonal and viewing distance so letter sizes are physically accurate.
- Read the Snellen rows: Cover one eye and read from top to bottom, then click the smallest row you can read clearly.
- Check the Amsler grid: Look at the center dot and confirm all grid lines are straight, then review your results.
Key Features
- Calibrated Snellen chart from 20/200 down to 20/20
- Amsler grid for central vision and macular health screening
- Per-pixel size calibration based on screen and viewing distance
- Click the smallest readable row for an instant acuity verdict
- No camera, no app installation - browser only
- Guidance on when to seek professional eye care
Frequently Asked Questions
Is this a substitute for a professional eye exam?
No. This is a screening tool. It can detect changes that warrant a visit to an optometrist or ophthalmologist, but it cannot replace a comprehensive eye exam.
Why do I need to enter my screen size and distance?
The Snellen fraction depends on the physical size of the letters and the viewing distance. Calibration makes the 20/20 row correspond to the correct physical angle on your specific screen.
What does the Amsler grid detect?
It screens for central vision problems, particularly macular degeneration. Wavy, distorted, or missing lines suggest a need for professional evaluation.
Is my screen data or results sent anywhere?
No. Everything runs locally in your browser - no data is transmitted, stored, or logged.