Answers

2015-11-14T12:42:57+05:30
Cataract- disease in which people form a layer on their cornea which disables them to see.
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2015-11-14T13:04:57+05:30
Some diseases are
night blindness:-it is a condition in which person feels difficulty in seeing in dim light as during the night and this is cause due to the deficiency of vitamin A
colour blindness:-It is a genetic defect in which some people cannot discriminate between cretain colours such as red and green.

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