1.

Explain Presbyopia using the following points- ( c) Correction.

Answer»

SOLUTION :( c) SOMETIMES people also suffer from nearsightdness as WELL as farsghtedness. In such a case, bifocal LENSES are required to correct the defect. In such lenses, the upper part is CONCAVE lens which correct nearsightedness, while the lower part is a convec lens which correct the farsightedness.


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