Our eyes don't adapt completely to a repeated visual stimulus because ________.

A) eye movements called microsaccades cause the stimulus image to vibrate slightly on the retina
B) the optic chiasm enables fibers to carry messages to all parts of the brain
C) ganglion cells fire continuously
D) visual acuity is greatest in the fovea

Microsaccades

Small, involuntary eye movements that occur when the gaze is fixed, helping in refreshing the image on the retina to prevent visual fading.

Optic Chiasm

The optic chiasm is a crucial part of the brain where the optic nerves partially cross, allowing visual information from both eyes to be processed by both hemispheres of the brain.