How this online contrast sensitivity test works

This browser exercise shows a stripe pattern that tilts left or right. Respond in each of eight trials per coarse, medium and fine pattern. After a correct answer the next pattern becomes fainter; after an incorrect answer it becomes more visible.

Understanding your result

The report shows the lowest contrast percentage you correctly identified at each scale. A smaller percentage is more difficult to detect. Because a forced-choice guess can be correct by chance, this is an exploratory result, not a calibrated contrast threshold or medical diagnosis.

Why does screen calibration matter?

Brightness, gamma, glare, pixel density and viewing distance affect contrast. Take repeated tests under similar conditions to compare your own results. This is not the clinical Pelli–Robson letter-chart protocol.