Posted by Krishnapriya on Feb. 18, 2014, 4:10 p.m.
MYOPIA(Short sight) The elongation of the eyeball results in MYOPIA.this can be corrected using concave lens a ASTIGMATISM Disorder in the curvature of cornea or lens affects vision.this result in the formation of incomplete and blurred images of objects.this condition is called ASTIGMATISM. HYPER METROPIA(Long sight) If the eyeball shortens,the image is formed behind the retina.such persons cannot see near objects clearly though they are able to see distant objects.this can be corrected using convex lens.