Structure of an Eye
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It serves as a protective covering for the front of the eye and also helps focus light on the retina at the back of the eye.
It controls the amount of light that enters the eye so that the pupil dilates and constricts.
The lens focuses light onto the retina.
The retina contains the cells that sense light (photoreceptors) and the blood vessels that nourish them.
Clear fluid formed by the ciliary body nourishes lens, iris and cornea.
Transfers image formed on retina to brain.