Which of the following defects of the eye reduces the amount of light reaching the retina?

myopia

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presbyopia

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cataract

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none of these

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Solution

The correct option is C
cataract

Explanation for correct option
The growth of a membrane over the eye lens is called a cataract.
This reduces the amount of light entering the eyes and blurs vision.
Explanation for Incorrect options :
Option (A) Myopia: It occurs when only near objects are not clearly visible to the eyes. The reason is that the image is formed in front of the retina.
Option (B) Presbyopia: Nearby objects are not visible in old age people due to the weakening of ciliary muscles.
Hence, the correct option is (C)

Suggest Corrections

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Q. (a) How does the convex eye-lens differ from the ordinary convex lens made of glass ?
(b) List, in order, the parts of the eye through which light passes to reach the retina.

The amount of light reaching the retina of the eye is controlled by?

Match the following in most appropriate way:
$\begin{matrix} Part of eye & Function a) Iris & p) Converts the light into neural signals, and send these signals on to the brain for visual recognition . b) Pupil & q) Primarily focuses and controls the entrance of light into the eye. c) Retina & r) Controls size of pupil and amount of light reaching the retina. d) Cornea & s) Focuses light onto the retina and help the eye to focus on objects at different distances. \end{matrix}$

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