Contrast Sensitivity

A measure of your visual system's ability to detect differences in luminance. Patterns fade progressively — how faint can you still detect? Contrast sensitivity declines before standard acuity, making it an early indicator of visual aging.

Coming soon.

01 /How to Play

A striped grating pattern will appear at decreasing contrast levels.
Indicate whether you can see a pattern (YES) or whether the screen looks blank (NO).
The contrast decreases with each correct detection — find your threshold.
Complete all rounds — your contrast sensitivity score is calculated.
Lower threshold = better vision.

02 /The Science

Contrast sensitivity function (CSF) measures the visual system's ability to detect spatial luminance differences across a range of spatial frequencies. Unlike standard Snellen acuity (20/20), CSF captures the full range of visual performance. Contrast sensitivity begins declining in the mid-30s and accelerates after 60, often before any decline in standard acuity is detectable. It is used clinically to assess early cataracts, glaucoma, and amblyopia.

Population Distribution

Based on population research data

03 /Pro Tips

Ensure your screen brightness is set to maximum for accurate results.
Test in a moderately lit room — not too bright, not too dark.
Blink naturally — eye strain degrades sensitivity.
If you wear glasses or contacts, wear them during the test.
Results may vary by screen quality — IPS panels provide the most accurate results.