Eyes may resemble still cameras or movie cameras, but it's probably more accurate to regard them as very active extensions of the brain.
Rembrandt
Unlike cameras, the eyes must contend with constantly changing input as images are jumping on the retinas.
We move our eyes about three times per second. Each time we do, the image projected on the retinal surface shifts and resets.
Velázquez
Although the process is mostly unconscious, we are always surveying the peripheral areas of the retina for where to jump next.
Right before your focus shifts from one point to another, a message travels from the motor cortex to the eye muscles predicting the movement and anticipating the observed result. A process called corollary discharge suppresses the signal during the jump so that we're not overwhelmed with the smeared image.
Despite all this frenetic movement we maintain the impression that the world is stable.
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