Question

With the help of a labelled diagram, explain the different parts of our eye.

Answer 1

The human eye is a very small sensitive organ which enables vision. The following diagram shows the internal structure of the eye. The internal parts of the eye with their functions is shown in the figure.

Sl.No	Part of the eye	Function
1.	Pupil	Inner aperture of the eye through which light enters
2.	Iris	Coloured part of the eye which regulates the amount of light entering entering the pupil by decreasing and increasing the size of the pupil
3.	Sclera	White part of the eye which contains clear watery fluid. It gives strength and protection to the eye.
4.	Cornea	A thin transparent layer in front of the eye which refracts the incoming light and also protects the rest of the eye from dust, germs and harmful foreign bodies. This is called the window of the eye.
5.	Retina	A lining behind the eyeball sensitive to light which has visual receptors such as rods and cones.
6.	Ciliary Muscles	Muscles in the eye which alter the curvature of the eye lens
7.	Lens	A transparent tissue between the pupil and retina which helps in focussing light
8.	Optic Nerve	The nerve that connects the eye to the brain transmitting impulses to the brain and back to the eye
9.	Blind spot	A portion in the retina insensitive to light where the nerve endings enter the optic nerve.