Online Tool Store
Contrast Sensitivity Test
View a progressively lower-contrast bar pattern grid as a general contrast sensitivity screening aid. Runs entirely in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Contrast test grid
View at arm's length in normal room lighting. Note the last bar pattern you can clearly see.
Bars run from highest contrast (left) to lowest (right).
This is a screening aid, not a diagnostic test — see an eye care professional for a clinical assessment.
How it works
- View the bar grid at arm's length in normal lighting.
- Note the faintest pattern you can still clearly distinguish.
- Use the result as a general awareness check, not a diagnosis.
The grid displays striped patterns at progressively lower contrast levels — similar in principle to a clinical contrast sensitivity chart, letting you get a rough sense of how well you distinguish low-contrast detail.
FAQ
Is this a medical diagnostic test?
No — this is a screening aid for general awareness, not a clinical diagnostic tool. See an eye care professional for an accurate assessment.
Is my result uploaded anywhere?
No. The test happens entirely in your browser — nothing is sent to a server.
What is contrast sensitivity?
The ability to distinguish an object from its background based on subtle differences in shading, distinct from visual acuity (which measures sharpness at high contrast, like a standard eye chart).
How should I take the test?
View your screen at arm's length in normal, even room lighting, and note the faintest bar pattern you can still clearly distinguish from the background.
How we compare
| Feature | Online Tool Store | Printed contrast charts | Clinical eye exam |
|---|---|---|---|
| Free, instant, no purchase | ✓ | Requires buying a physical chart | Requires an appointment |
| Clinically validated result | Screening aid only | Screening aid only | ✓ |
A clinical exam gives a validated result but requires an appointment. Contrast Sensitivity Test is a free, quick screening aid for general awareness — not a substitute for professional care.