Question

What is presbyopia ? State its cause. How is it corrected ?

Answer 1

HII DOST

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THE DEFFECT OF VISION IN WHICH WE CAN'T SEE NEAR AS WELL AS FATHER OBJECT IS KNOWN AS PRESBYOPIA.

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SOLUTION ::

IN OUR SPECTACLES AT THE UPPER SIDE WE USE CONCAVE LENS AND AT THE LOWER SIDE USE CONVEX LENA.

SO WITH CONCAVE LENS WE CAN SEE FATHER OBJECT AND FOR THE CONCAVE LENS WE CAN SEE NEAREST OBJECT.

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HOPE IT HELP YOU

PLEASE MARK AS BRAINLIST

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Answer 2

In presbyopia, person can't see distant object as well as nearby object clearly due to the loss of accommodation of the eyes.

It is also called old age longsightedness.

Cause :-

The loss of accommodation power of the eyes due to weakening of the ciliary muscle, and

Due to hardening of the eye lens.

Correction :-

By using spectacles made from bifocal lens ( concave lens and convex lens ) of suitable power.