It controls the amount of light entering into the eye.
It is responsible for controlling the diameter and size of the pupil.
It protects the eye and allows the light to pass.
d. Eye lens
It focuses the image changing the focal length.
e. Ciliary muscle
It helps in changing the focal length of the eye lens.
It sends the electric impulses to the brain through the optic nerve.
g. Optic nerve
It acts as the medium to transmit the impulses to and from the brain and retina.
It helps the eyeball to retain its shape.