Parts of human eyes? Describe
Eye is an important part of our body with the help of which we see this beautiful world. There are many similarities in the design of the eye and the photographic camera. Just as a convex lens in a photographic camera creates an inverted restriction of the object in front on the film, in the same way we have a convex lens made of cells, which creates an inverted image of the object in front of our eye on the 'retina'.
The shape of our eye is like a small round ball. The eye can see the near and distant objects clearly by changing the focal length of the lens made of cells.
The ability of the human eye, by which it can clearly see the nearby and distant objects, is called the adjustment ability of the human eye.
Following are the main parts of human eye-
1. Sclera- It is a white opaque part made of muscles, which covers and protects the eyeball. It is also called white plate.
2. Cornea- It is the transparent part raised in front of the rigid retina, through which light enters the eye. It protects the eye as well as helps in focusing the light to some extent.
3. Iris- There is a curtain behind the iris cornea. Its color can be different for different people and countrymen.
4. Pupil - There is a small hole in the middle of the iris, which is called the pupil.
5. Eye lens- The eye lens is held in its position by the ciliary muscles behind the pupil. The eye lens is like a transparent membrane made up of different types of living cells.
6. Ciliary muscles- The muscles hang from the joint of the protruding part of the white sclera, between which the eye lens hangs. These muscles can increase or decrease the focal length of the lens by applying pressure.
7. Eyedrop- A transparent fluid is filled between the cornea and the eye lens. This is called the eye.
8. Retina- It is a sensitive transparent membrane on which many photosensitive nerves are located. These nerves are connected to the brain. When these nerves send the signals of the image formed on the retina to the brain, they straighten it. Therefore, the brain directly perceives the reverse restriction of the object placed on the retina.
9. Visceral fluid- A transparent fluid is filled between the eye lens and the retina, which is called vitreous fluid.
People with normal vision can see far and near objects clearly. No defects are found in the eyes of such persons, but due to increasing age or other reasons, some defects arise in the human eye, due to which he is not able to see objects near or far away or both. . To remove these defects, glasses made of concave and convex lenses or both lenses are used.
The minimum distance of clear vision for a healthy eye is 25 cm and the maximum distance is infinite.
Human eye care
Our eyes are a precious gift of nature. Without them we cannot see the world full of various colours. Eyes are very useful for our life. They serve us throughout their life. Eyes are very delicate as compared to other parts of our body. That is why we should take proper care of our eyes and protect them from possible side effects.
Some simple precautions for eye protection are as follows-
1. Wash your eyes with cold and clean water at least twice a day.
2. Do not use too dim or too bright light while reading or working.
3. While watching TV, reading or doing any other work with eyes, give rest to the eyes in between. The TV should be kept in a darkened room and not seen from too close.
4. Do not rub the eye if any granule or dust particle enters the eye. At such times wash the eye with cold water and contact the eye doctor as needed.
5. Inattention while playing or doing other work can sometimes cause damage to our eyes. If such an accident occurs, consult an eye doctor instead of self-medicating.
6. If you feel tension in the eyes while reading or looking at the black board and have a headache, then go to the eye doctor and get the eyes checked.
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