A person with limited accommodation is prescribed lenses of power -3.0 diopters for distant vision.Bifocal inserts are added to these lenses to allow vision at 50 cm.What is the power of the inserts?
A)-1.0 diopters
B)2.0 diopters
C)5.0 diopters
D)50 diopters
E)This does not work with negative diopter distance lenses.

Question

A person with limited accommodation is prescribed lenses of power -3.0 diopters for distant vision.Bifocal inserts are added to these lenses to allow vision at 50 cm.What is the power of the inserts?
A)-1.0 diopters
B)2.0 diopters
C)5.0 diopters
D)50​ diopters
E)​This does not work with negative diopter distance lenses.

Quizplus · Accepted Answer

The power of the lens needed for near vision at 50 cm is +2.0 diopters, calculated using the formula P = 1/f, where f is the focal length in meters (0.5 m in this case).

A Person with Limited Accommodation Is Prescribed Lenses of Power