Understanding Far Points and Lens Power in Correcting Myopia

[physics148]

Homework Statement

While carrying contact lenses of D=-2.00 diopters, a nearsighted person takes a vision test and finds that his/her far point is 10.0m
a) what is the person's far point without contact lenses?
b) what lens power is required to correct the myopia fully?

Homework Equations

1/f = 1/o + 1/i
D=1/f

The Attempt at a Solution

This problem was for homework in our optics class, but I don't know how to start the problem. Its not like the usual problems I've been doing. Any help would be greatly appreciated.

 

[Simon Bridge]

If you knew the far-point without correction, how would you determine the diopter value of the corrective lenses required?
How does the position of the far-point depend on the lenses used?

 

[andrevdh]

Do you know what the far point is?