How the eye processes light
The eye functions in several stages:
- Light enters through the cornea. The cornea focuses the light and passes it through the pupil (the black opening in the colored iris).
- The lens re-focuses the light that has come through the pupil, projecting the focused image on the retina.
- Cells in the retina convert the light forming the image to electrical impulses, and the optic nerve takes the signal to the primary visual cortex of the brain. The signals convey information about the intensity of light and its color, as well as spatial information.