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The Human eye is one of the most important sense organs.It enables us to see the object and colours around us.
The front portion is more sharply and is covered by a transparent protective membrane called "cornea".
Behind the cornea,there is place filled with a liquid called "aqueous chamber".
Between the aqueous humour and the lens,we have a muscular diaphragm called "iris"which has a small hole in it is called "pupil".
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The given figure shows the structure of human eyeThe given figure shows the structure of the human eye.The human eye is roughly spherical in shape with diameter of about 2.3 cm. It consists of a convex lens made up of living tissues. Hence, human lenses are living organs contrary to the simple optical lenses. The   white of the eye   is known as the   sclera . It is the tough, opaque tissue that protects the outer layer of the eye.   Iris   is the coloured part of the eye, and the   pupil   is the black,

The following are the main parts of the human eye and their respective functions.
1.Pupil -Opens and closes in order to regulate and control the amount of light
2.Iris -Controls light level similar to the aperture of a camera
3.Sclera -Protective outer coat
4.Cornea -Thin membrane which provides 67% of the eye’s focusing power
5.Crystalline lens -Helps to focus light into the retina
6.Conjunctiva -Covers the outer surface (visible part) of the eye
7.Aqueous humour -Provides power to the cornea
8.Vitreous humour -Provides the eye its form and shape
9.Retina -Captures the light rays focussed by the lens and sends impulses to the brain via optic nerve
10.Optic nerve -Transmits electrical signals to the brain
11.Ciliary muscles -Contracts and extends in order to change the lens shape for focusing.
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