describes the structure of the human eye , elaborating the function of each part?
Answers
Answer:
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Explanation:
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 eye through the cornea.
Iris: A dark muscular tissue and ring-like structure behind the cornea are known as the iris. The colour of the iris actually indicates the colour of the eye. The iris also helps regulate or adjust exposure by adjusting 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 colour vision.
Rods: Rods are the optic nerve cells that are more sensitive to dim lights. They help in peripheral vision.
Answer:
main main parts of eyes
are
1. cornea it is a thin membrane which covers the transparent bulge on the surface of eyes and cause most of refraction for light rays entering the eye
2. iris is the dark muscular assembly behind the cornea and it control the size of pupil
3. pupil is the small circular aperture whose size is controlled by iris
4.ciliary muscles hold the eye lens in position it control the focal length of eye lens
5.eyelens is the convex lens made up of a
transparents soft of flexible materials like jelly
made of protein
6.retina a light sensitive screen on which image is formed by eyelens called retina retina contain very cell in the shape of rod and cone
7. optic nerve is formed by nerve fibre coming from retina its and the electric signal to the brain
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