A nearsighted person cannot see objects clearly beyond 50 cm (the far point). If the patient has no astigmatism and contact lenses are prescribed, what is the power of the lens required to correct the patient's vision?
A) "-2.0 diopters"
B) "-3.3 diopters"
C) "-4.0 diopters"
D) "-5.0 diopters"

Question

Quizplus · Accepted Answer

The power of the lens required to correct the patient's vision is given by the formula:P = 1/f = 1/(d_o - d_i)where d_o is the object distance (50 cm) and d_i is the image distance (at the retina, which is about 2.5 cm).Plugging in these values, we get:P = 1/f = 1/(0.5 m - 0.025 m) = 2.0 diopters

A Nearsighted Person Cannot See Objects Clearly Beyond 50 Cm