What power contact lens should be used to correct the vision of a farsighted person whose near point is 80 cm to see something clearly at a distance of 25 cm?
A) 2.8 diopters
B) -2.8 diopters
C) -4.0 diopters
D) -4.2 diopters
E) 4.2 diopters

Question

Quizplus · Accepted Answer

To correct farsightedness, the lens should bring the near point from 80 cm to 25 cm. Using the lens formula (1/f = 1/v - 1/u), where v = 25 cm and u = -80 cm, the power (P = 1/f) is calculated to be approximately 2.8 diopters.

What Power Contact Lens Should Be Used to Correct the Vision