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 is calculated using the formula P = 1/f, where f is the focal length in meters. Since the far point is 50 cm (0.5 meters), the power needed is P = 1/0.5 = 2 diopters. Since the person is nearsighted, the lens power is negative, so the correct answer is -2.0 diopters.

A Nearsighted Person Cannot See Objects Clearly Beyond 50 Cm