Incoming light refers to the light that enters the eye through the cornea and pupil, which is then focused onto the retina for visual processing.
Cornea: The transparent outer layer of the eye that helps refract (bend) incoming light.
The adjustable opening in the center of the iris that controls how much light enters the eye.
A flexible structure behind the iris that further refracts (bends) and fine-tunes incoming light before it reaches the retina.