Vision physics question?

Question

what power contact lens is needed to correct the vision of a person who has a far point of 1.00 m? If this person has a normal 8.00% ability to accommodate (increase) the power of her eyes, what is the closest object she will be able to see clearly with contacts on?

Answer 1

Accommodation is in units of diopters, not percents. Assuming 8 diopters accommodation, and that the contacts correct her far point to infinity, she will be need a -1 diopter correction and will able to focus down to 1/8 m.