Vision Problems: As a treatment for cataracts (a cloudiness of the lens of the eye), the natural lens is removed and a plastic lens is implanted. After this is done a person can see distant objects clearly, but he cannot accommodate to focus on nearby objects. If such a person wanted to read a book at a distance of 25 cm, he would have to wear contact lenses having a diopter power of
A. +2.78 diopters
B. +3.33 diopters
C. -1.78 diopters
D. +4.00 diopters
E. -4.00 diopters
Answer: D
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