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.