People who suffer from cataracts may have the lenses in their eyes replaced by a

Question

People who suffer from cataracts may have the lenses in their eyes replaced by artificial lenses. (a) If a given person has a distance of 22.0 mm between her lens and retina, what refractive power would an artificial lens need to have to allow her to see far away objects clearly? (b) There is no accommodation with the artificial lens, so she has to use glasses to focus on objects close-up. If an object is held 25.0 cm away from her glasses, what is the refractive power of the glasses she will need to see the object clearly?

Explanation / Answer

a)f=22mm=0.022m

P=1/f=1/0.022=45.45D

b)f=25cm=0.25m

P=1/f=1/0.24=4D

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