Contrast Sensitivity Test
Test how well your eyes detect low-contrast details. 10 levels from high to nearly invisible contrast.
How Contrast Sensitivity Test Works
Test your contrast sensitivity with 10 levels of decreasing contrast. online vision screening for contrast perception. and instant. Answer the questions honestly and the tool calculates your result based on research-backed criteria — everything runs privately in your browser.
Understanding Contrast Sensitivity
Contrast sensitivity measures your ability to distinguish an object from its background. Unlike visual acuity (which tests sharpness with high-contrast black letters on white), contrast sensitivity tests how well you see in real-world conditions where objects often blend with their surroundings.
Why Contrast Sensitivity Matters
Good contrast sensitivity is essential for daily activities like driving at dusk, navigating stairs in dim lighting, and reading text on colored backgrounds. People with reduced contrast sensitivity may have 20/20 visual acuity but still struggle in low-light or low-contrast situations.
Conditions That Affect Contrast Sensitivity
Cataracts are one of the most common causes of reduced contrast sensitivity, as the clouded lens scatters light. Other conditions include glaucoma, diabetic retinopathy, age-related macular degeneration, and optic neuritis. Even after LASIK surgery, some patients experience temporary contrast sensitivity changes.
How the Test Works
This test displays letters at 10 decreasing contrast levels. At level 1, the letter is clearly visible. By level 10, the letter is nearly invisible against the background. Your score reflects the lowest contrast level at which you can correctly identify the letter. Most people with normal vision can see levels 1 through 7 or 8.
Improving Contrast Sensitivity
If cataracts are the cause, surgery to replace the clouded lens typically restores contrast sensitivity. For other conditions, treating the underlying cause is key. Anti-glare coatings on glasses, yellow-tinted driving lenses, and proper lighting in your home and workspace can also help.
When to See a Doctor
If you score significantly below normal or notice a change in your ability to see in dim lighting, consult an eye care professional. Clinical contrast sensitivity tests like the Pelli-Robson chart provide precise measurements that guide treatment decisions.
Frequently Asked Questions
What is a normal contrast sensitivity score?
Most people with healthy vision can correctly identify letters at levels 1 through 7 or 8 out of 10. Scores of 9-10 indicate excellent contrast perception. Below level 5 may suggest reduced sensitivity.
Is contrast sensitivity the same as visual acuity?
No. Visual acuity measures sharpness with high-contrast letters. Contrast sensitivity measures how well you see objects that blend with their background. You can have 20/20 acuity but poor contrast sensitivity.
What causes poor contrast sensitivity?
Common causes include cataracts, glaucoma, diabetic retinopathy, macular degeneration, and optic nerve conditions. Age-related changes, some medications, and refractive surgery can also affect it.
Can I improve my contrast sensitivity?
Treating the underlying condition (like cataract surgery) can restore contrast sensitivity. Anti-glare coatings, yellow tinted lenses, and good lighting also help in daily life.
Does screen brightness affect this test?
Yes. For the most accurate results, set your screen to medium brightness in a well-lit room. Very bright or very dim screens will affect the contrast levels displayed.
Is Contrast Sensitivity Test free to use?
Yes, Contrast Sensitivity Test is completely free with no sign-up, no login, and no hidden fees. The tool runs entirely in your browser — your data never leaves your device.
Is my data safe when using this tool?
Yes. This tool runs 100% in your browser using JavaScript. No data is sent to any server, stored in any database, or shared with any third party. When you close the page, processing stops immediately.
Does this tool work on mobile devices?
Yes. Contrast Sensitivity Test is fully responsive and works on smartphones, tablets, and desktop computers. The interface adapts to your screen size automatically.
Can I use this tool offline?
Yes. Once the page has loaded, Contrast Sensitivity Test works without an internet connection. All processing happens locally in your browser.
Do I need to create an account to use Contrast Sensitivity Test?
No. Contrast Sensitivity Test requires no account, no registration, and no email. Just open the page and start using it immediately. Your inputs are auto-saved in your browser for convenience.