The lot of light entering the eye is controlled through the pupil.

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The pupil is a small empty an are surrounded through the iris.The iris contracts and also relaxes to control the size of the pupil.When that is dark, the pupil expands to allows more light to get in the eye.Iris controls the pupil which inturn controls the quantity of light entering the eye.The pupil is simply an flexible opening, the iris is a membrane.When the is bright, the pupil contract to prevent an ext light native entering the eye. 
Sclera

It maintains the form of one eyeball and provides a sturdy attachment for the extraocular muscle that controls the motion of the eyes. 

Cornea

It acts together the eye’s outermost lens.

Retina

It receive light and sends signals to the brain for intuitive recognition.


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