Question

different types of eye defects and lenses used for correcting the eye defect

Answer 1

Hello Dear,

◆ Eye defects (Refractive errors) -

• Refractive errors means there is defect in focusing incident light rays on retina.

Common refractive errors are

(1) Hypermetropia (far sightedness) -

• corrected by convex lens

(2) Myopia (short sightedness) -

• corrected by concave lens

(3) Astigmatism (multiple meridians) -

• corrected by cylindrical lens

(4) Presbyopia (old age hypermetropia) -

• corrected by bifocal lens

Best luck dear. Hope this helps you...

Answer 2

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.