Answers

2016-03-19T14:35:04+05:30
Hyper metropia is a situation where people cannot  see the objects which are placed near.
cause damage to iris.
genetic problems.
correction usin bi-convex lens.

presbiopia occurs due to oldage.
it causes vision defects of far sightedness
correction according to defect..... bi-convex or concavo-convex
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