A 80 year old man has a near point of 120cm. What power lens (in diopters) does

Question

A 80 year old man has a near point of 120cm. What power lens (in diopters) does the man need in order to be able to see an object clearly at the normal near point of 25cm? Assume that the man will get contact lenses, that is neglect the two centimeters that glasses would be away from the eye. Enter answer in diopters without units. Reading glasses of what power (D) are needed for a person whose near point is 100cm, so that he can read a computer screen at 47.9cm? Assume a lens eye distance of 1.52cm. Do not enter units. Correct, computer gets: 1.14e + 00

Explanation / Answer

1/1.2D=0.833D 1/.479-.25=4.37D

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