Question

what is presbyopia which type of lens is use in this​

Answer 1

Answer:

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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