The Eye

Structure, how it works,correcting eye problems

Parts of the eye

Light is focused mostly by the cornea, almost like a camera lens.

The iris is a thin, circular structure in the eye, responsible for controlling the diameter and size of the pupil and thus the amount of light reaching the retina.

The (crystalline) lens is a transparent structure that, along with the cornea, helps to refract to the retina.

Light coming by the cornea and crystalline lens then reaches the retina, the light-sensitive inner lining of the back of the eye. The retina acts like an image sensor of a digital camera, converting optical images into signals. The optic nerve then transmits these signals to the visual cortex, the part of the brain that controls the sense of sight.

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Correcting eye problems

Until contact lenses were invented in the 1950s, eyeglasses had been the only practical way to correct refractive vision errors for at least the seven centuries.

Now, several modern approaches to corrective eye surgery are from laser reshaping of the eye's surface in operations like LASIK and PRK to surgical insertion of artificial lenses to correct eyesight.

How it works

The lens focuses light through a clear gel-like substance that is between the lens and the retina. The retina receives the image that the cornea focuses through the eyes internal lens and makes an image into electrical impulses that are carried by the optic nerve to the brain.


In conclusion the main parts of the eye are the lens, cornea, retina and iris. and it works almost like a camera.