plz define parts of an eye in an easy n understanding way urgently - Science - The Human Eye and the Colourful World

Question

plz define parts of an eye in an
easy n understanding way urgently

Ishan Goyal · Accepted Answer

We are able to see things with the help of our eyes The Eye is
one of the most important sense organs Let us see the structure of
our eye
The Shape of the eye is roughly spherical with an average
diameter of around 2 3 cm The outer part of the eye is quite tough
and white in colour This white part of the eye is known as
sclera The transparent, front outer covering of the eye is
known as the cornea Behind the cornea, there is a colored
membrane known as the iris It regulates the amount of light
entering the eye It also gives colour to the eye In the iris, there
is a variable sized, black circular opening known as the
pupil Its size is controlled by the iris It appears to be
black in colour because most of the light entering it is absorbed
by the tissues, which are present in the pupil
The size of the pupil depends on the brightness of light It
opens and closes in order to regulate and control the amount of
light entering the eye When we enter a dimly lit room, it takes the
iris some time to expand the pupil to allow more light to enter the
eye For this reason, it takes us a few seconds to clearly see
objects in a dimly lit room

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Behind the pupil there is a lens which is thicker at the centre
It is made up of living cells Two Ciliary muscles
hold the lens within the eye-ball The eye lens being convex in
nature converges the light rays’ incident on it Hence, it
focuses the light falling on it on a thin layer of nerve cells
called the retina The retina is made up of a large number of
nerve cells Light falling on these nerve cells stimulate two kinds
of sensitive cells known as cones and rods Rods are
sensitive to low light levels Cones are sensitive to bright light,
but they sense colours Sensation felt by them is transmitted to the
brain in the form of electrical signals through the optic nerve
This allows us to see

. No.	Human eye part	Function
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	Protects the outer coat
4.	Cornea	Thin membrane which provides 67% of the eyeâ€™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.

plz define parts of an eye in an easy n understanding way urgently..........