Question

night blindness is caused due to the deficiency of

Answer 1

it is caused due to the deficiency of vitamin A

Answer 2

Hey Friend,
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Question: 
Night blindness is caused due to the deficiency of

Solution:

Night blindness is caused due to the deficiency of vitamin A or retinol.

Night blindness:  is also caused due to cataract or nearsightedness 

Symptoms of night blindness are:

Blurred vision 

Clouding of eye lens

Treatment may be eating carrots as it is rich is vitamin A
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