Olga is nearsighted and cannot see things beyond 90 cm cm from her eyes.What is the refractive power of the contact lenses that will enable her to comfortably see distant buildings clearly?
A)+1.1 diopters
B)-1.1 diopters
C)-1.7 diopters
D)-2.2 diopters
E)+2.2 diopters

Question

Quizplus · Accepted Answer

Nearsightedness (myopia) is corrected with lenses that have a negative diopter value. The refractive power (P) needed can be calculated using the formula P = 1/f, where f is the focal length in meters. For Olga, f = 0.9 meters (90 cm). Thus, P = 1/0.9 = 1.11 diopters, rounded to -1.1 diopters to indicate a negative value for myopia correction.

Olga Is Nearsighted and Cannot See Things Beyond 90 Cm