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Question

Choose the option that correctly describes night blindness.


A

No visibility at night

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B

Visibility decreases in low light

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C

Visibility decreases in daylight

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D

Visibility increases during night

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Solution

The correct option is B

Visibility decreases in low light


Night blindness means a person loses his/her ability to see in low light due to impaired function of specific vision cells in the retina. It does not mean that the person is completely blind during the night. Such a condition occurs due to an insufficient amount of vitamin A in the diet.


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