When you stare at a picture for a long time, it doesn't fade away because your eye is making tiny eye movements that are called glissades.

Name: When you stare at a picture for a long time, it doesn't fade away because your eye is making tiny eye movements that are called glissades.
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Quizplus · Accepted Answer

The tiny eye movements are called microsaccades, not glissades. Microsaccades refresh the image on the retina, preventing it from fading.

When You Stare at a Picture for a Long Time