Question

State the defects of vision in human eyes and its remedies. Explain the defect of myopia and remedies to control it.

Answer 1

Hint: Myopia is commonly known as near-sightedness and it is otherwise known as short sightedness. Myopia is an eye defect, where the affected person can see the close object clearly, but far object is blurry. It occurs if the shape of the eye causes light rays to refract in correctly, and focus the image in front of the retina.

Complete step by step answer:
(i) Myopia:
Myopia is one of the eye disorders, where the affected person can see the close object clearly. Myopia is also known as nearsightedness and shortsightedness. As the name indicates, shortsighted where the people can see the nearby objects very clearly.

(ii) Symptoms:
Myopia symptoms may include
1. Blurry vision when looking at far objects
2. Headache caused by eye pain
3. Eye fatigue

(iii) Remedies of myopia:
In this disorder the eye lens gets affected and focuses the object in front of the retina. And this disorder can be corrected by using eyeglasses, contact lenses and surgeries like LASIK. But more common, myopia can be corrected by using a concave lens.

The myopia disorder can be corrected by using a concave lens in front of eyes. In myopia the image is not focused in the eye retina. The image is focused in front of the eye retina. By using a concave lens, it corrects the image path and focus to the eye retina. So, the myopia eye disorder is corrected by using a concave lens.

Note: The main role of the concave lens in correction of myopia disorder is to diverge the light rays from the distant object, to prevent it from focusing in front of the eye retina. Thus, the concave lens helps the light ray to fall on the eye lens in a wide manner as compared to the light ray fall on the eye lens without a concave lens.