Presbyopia correction and pupil light control

Question 1

The elderly people, may have both near sightedness and far sightedness. Write the possible solutions, can be proposed for correction of their eye defect.

Accepted Answer

This defect is Presbyopia. It can be corrected using **bifocal lenses**. The upper portion consists of a concave lens to facilitate distant vision, and the lower portion consists of a convex lens to facilitate near vision.

Question 2

How does the eye control the amount of light entering into it?

Accepted Answer

The **iris** controls the size of the **pupil**. In bright light, the iris contracts the pupil to reduce light intake. In dim light, the iris expands the pupil to allow more light to enter.

Presbyopia correction and pupil light control

Passage / data set

Question 1 of 2

Explanation

Question 2 of 2

Explanation

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