Question

different types of lenses used for correcting eye defects and report on it

Answer 1

Vision problems such as myopia and hyperopia can be corrected with lenses that help focus light on the retina.
Myopia is corrected with a concave lens, while hyperopia is corrected with a convex lens.


Myopia is also called nearsightedness. It affects about one third of people. People with myopia can see nearby objects clearly, but distant objects appear blurry.Myopia is corrected with a concave lens, which curves inward like the inside of a bowl. The lens changes the focus, so images fall on the retina as they should.

Farsightedness is also known as hyperopia . It affects about one fourth of people. People with hyperopia can see distant objects clearly, but nearby objects appear blurry. In hyperopia, the eye is too short. This results in images being focused in back of the retina.

Hyperopia is corrected with a convex lens, which curves outward like the outside of a bowl. The lens changes the focus so that images fall on the retina as they should. Common signs of farsightedness include difficulty in concentrating and maintaining a clear focus on close objects, eye strain, fatigue and headaches after close work, and aching or burning eyes, especially after intense concentration on close work

Answer 2

Answer:

Answer:

Eye defects:-

→ Eye defects means there is defect in focusing incident light rays on retina.

Some Common eye defects are :-

→ Hypermetropia

• Also known as Far sightedness.
• Corrected by Convex Lens

→ Myopia

• Also known as Short sightedness.
• Corrected by Concave Lens

→ Astigmatism

• Also known as Multiple Meridians.
• Corrected by Cylindrical Lens.

→ Presbyopia

• Also known as Old Age Hypermetropia.
• Corrected by Bifocal Lens.