Draw and label human eye. Explain its parts.
Answers
Answer:
The eye is an important and one of the most complex sense organ that we humans are endowed with. It helps us in visualizing objects and also helps us in light perception, color, and depth perception. Besides, these sense organs are pretty much similar to cameras, and they help us see objects when light coming from outside enters into them. That being said, it is quite interesting to understand the structure and working of a human eye. It helps us also in understanding how a camera also actually functions. Let’s have a glance on the human eye – it’s structure and function.
Structure of Human Eye
A human eye is roughly 2.3 cm in diameter and is almost a spherical ball filled with some fluid. It consists of the following parts:
Structure of Human Eye
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:
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Explanation:
Cornea: At the front of the eye is a clear, transparent layer called the cornea.
Iris: Behind the cornea is the iris, the colored part of the eye. The iris adjusts the amount of light entering the eye by opening the pupil wider in dim light and narrower in bright light.
Pupil: In the middle of the iris is a hole called the pupil.
Lens:Behind the iris is a convex lens made of a tough gelatinous material.
Aqueous humour:The area between the cornea and the lens contains a transparent liquid called the apueous humour.
Vitreous Humour: The area between the lens and the retina contains a transparent jelly-like substance called vitreous humour.
Retina: It is the area where the image is formed.
Blind Spot: The blind spot is an area on the retina that does not have any nerve cells. Therefore, the image that falls on this region will not be seen.
Optic Nerve: When light falls on the retina, the nerve cells are stimulated and transmit the impression to the brain by means of the optic nerve.
Ciliary Muscles: They hold the lens in place. They contract and relax to alter the thickness of the lens, enabling the eye to see far and near objects equally clearly.
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