Distinguish between myopia and hypermyopia?
Answers
Myopia:
➣In this defect, human eye can see nearby objects distinctly but is unable to see distant objects clearly.Image of distant object is formed in front of retina.
➣Eye ball is lengthened or lens is curved.
➣This defect is corrected using concave lens.
➣This defect can be corrected by using a concave lens of suitable power.
➣A concave lens of suitable power will bring the image back on to the retina and thus the defect is corrected.
Hypermetropia:
➢In this defect human eye can see distant objects distinctly but is unable to see nearby objects clearly. Image of nearby objects falls behind retina.
➢Eye ball is shortened or lens is flattened.
➢This defect is corrected using convex lens.
➢This defect can be corrected by using a convex lens of appropriate power.
➢Eye-glasses with converging lenses provide the additional focussing power required for forming the image on the retina.
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