Question

describe the different part of human eyes and state their function

Answer 1

Sclera: It is the outer covering, a protective tough white layer called the sclera (white part of the eye). Cornea: The front transparent part of the sclera is called cornea. Light enters the eyethrough the cornea.
Iris: A dark muscular tissue and ring like structure behind the cornea are known as the iris.Pupil: A small opening in the iris is known as a pupil. Its size is controlled by the help of iris. It controls the amount of light that enters the eye.Lens: Behind the pupil, there is a transparent structure called a lens. By the action of ciliary muscles, it changes its shape to focus light on the retina. It becomes thinner to focus distant objects and becomes thicker to focus nearby objects.Retina: It is a light sensitive layer that consists of numerous nerve cells. It converts images formed by the lens into electrical impulses. These electrical impulses are then transmitted to the brain through optic nerves.Optic nerves: Optic nerves are of two types. These include cones and rods.Cones: Cones are the nerve cells that are more sensitive to bright light. They help in detailed central and color vision.Rods: Rods are the optic nerve cells that are more sensitive to dim lights. They help in peripheral vision. FUNCTION - The eye has many parts that must work together to produce clear vision: The sclera, or white part of the eye, protects the eyeball. The pupil, or black dot at the centre of the eye, is a hole through which light can enter the eye. The iris, or coloured part of the eye, surrounds the pupil

Answer 2

The anatomy of the eye

The eye has many parts that must work together to produce clear vision:

The sclera, or white part of the eye, protects the eyeball.

The pupil, or black dot at the centre of the eye, is a hole through which light can enter the eye.

The iris, or coloured part of the eye, surrounds the pupil. It controls how much light enters the eye by changing the size of the pupil.

The cornea, a clear window at the front of the eye, covers the iris and the pupil.

A clear lens, located behind the pupil, acts like a camera lens by focusing light onto the retina at the back of the eye.

The retina is a light-sensitive inner lining at the back of the eye. Ten different layers of cells work together in the retina to detect light and turn it into electrical impulses.