Question

explain cataract and colour-blindness

Answer 1

cataract......
the crystalline lens of some people in old age becomes hazy or even opaque due to development of membrane over it which leads to decrease or loss of vision of eye .
this can be removed by surgery to restore clear vision

colour blindness....
some people do not possess some cone cells that respond to certain specific colour .
this is genetic disorder called colour blindness..





hope tis ans will help u.....

Answer 2

it is a defect in eye cataract