Question

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what are the 3 defects of vision? and give the method of correction how its correct and also explain.

Answer 1

Defects in human eye:-
1. Myopia
2.Hyper myopia
3. Presbyopia

$\bold{step \: by \: step \: explaination}$

$\color{red}1.)myopia$
It is the defect in which the person can see the near object clearly but he/she can't see far object clearly.

$\boxed{correction = concave \: lens}$

$\color{red}2.)hypermyopia$
It is a defect in which person can't able to see far object clearly but can see near object clearly.

$\boxed{correction = convex \: lens}$

$\color {red}3.)presbyopia$
It is a defect in which the person can't see both near and far object.

$\boxed{correction = by - focal \: lens}$

Upper lens - cancave lens
Lower lens - convex lens

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