Describe the main parts of the human eye and their functions, and explain how accommodation of the eye works.

Question

Accepted Answer

The main parts of the eye are: the cornea (transparent front layer that does most of the light refraction), the pupil (opening through which light enters, size controlled by the iris), the iris (coloured muscle controlling pupil size), the eye lens (a natural convex lens made of crystalline protein), the ciliary muscles (attached to the lens, controlling its thickness), the retina (light-sensitive layer with rod cells for brightness and cone cells for colour), and the optic nerve (carries the image signal to the brain).