Question

which lens is used for presbyopia?give reasons

Answer 1

this defect of vision corrected by using the suitable lens made from"" bifocal lens". in this type of lens the lower portion is convex lens to focus close object. and upper portion is concave lens to focus on far object. Presbyopia is special case of hypermetropia.we can call it old age hypermetropia.

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Answer 2

Answer:

lower portion is convex lens and upper portion is concave lens

Explanation:

because convex lens is used to see smaller objects as larger objects and concave lens is used to see larger objects as smaller objects

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