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The retina is  a layer at the back of the eyeball.That contains cells sensitive to light,which triggers nerve impulses.That pass via the optic nerve to the brain, where a visual image is formed. There are rods and cones in your eye cones see colour and rods see black

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8\9\17
The lens is a transparent structure  in the eye that helps refract light to be focused on the retina  The lens, by changing shape, functions to change the focal distance of the eye so that it can focus on objects at various distances, therefor allowing a sharp image of the object of interest to be formed on the retina. The lens is situated behind the pupil and the iris. The ciliary can expand and retract the lens.The lens rounds

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Pupil 8.9.17
The pupil is a hole in the iris that lets light to strike the retina. And it will shrink and widen depending on the amount of light entering it.

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The optic nerve 8-9-17

What it is: The optic nerve is a nerve connected to the brain near the back of the eyeball.

The function: Signals from the retina are carried to the brain by this nerve.Cells convert shapes ,shadows and colours to messages that the optic nerve receives. These cells are called rods and cones. The rods only see in black and white. They help to form the shading and shapes in an image. The

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Cornea
The transparent layer forming the front part of your eye.
it is responsible for 65-75% of your focusing power.
when light strikes it bends or refracts.