collect information about different types of eye defects briefly in the form of procedure of a project
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there are four type of eye defect
1) myopia:-a short sightend can see only nearer object. this defect is corrected by usr of a concave lens .
2) hypermyopia:-a long sighted eye can see distant object clearly but nearer object are not clear visible . corrected by this defect convex lens
3) presbyopia:-this defect both near and far objects are not clearly visible . it is an old age disease. corrected by using bifocal lens.
4)astigmatism:- in this defect eye can't see horizontal and vertical line clearly simultaneously. it is due to imperfect spherical nature of eye lens . corrected by using cylindrical lens.
1) myopia:-a short sightend can see only nearer object. this defect is corrected by usr of a concave lens .
2) hypermyopia:-a long sighted eye can see distant object clearly but nearer object are not clear visible . corrected by this defect convex lens
3) presbyopia:-this defect both near and far objects are not clearly visible . it is an old age disease. corrected by using bifocal lens.
4)astigmatism:- in this defect eye can't see horizontal and vertical line clearly simultaneously. it is due to imperfect spherical nature of eye lens . corrected by using cylindrical lens.
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