Solved: Surgical Vision CorrectionLight that enters your
Chapter 19, Problem 59PP(choose chapter or problem)
Problem 59PP
Surgical Vision Correction
Light that enters your eyes is focused to form an image on your retina. The optics of your visual system have a total refractive power of about +60 D—about +20 D from the lens in your eye and +40 D from the curved shape of your cornea. Surgical procedures to correct vision generally do not work on the lens; they work to reshape the cornea. In the most common procedure, a laser is used to remove tissue from the center of the cornea, reducing its curvature. This change in shape can correct certain kinds of vision problems.
Suppose a woman has a far point of 50 cm. How much should the refractive power of her cornea be changed to correct her vision?
A. -2.0 D
B. -1.0 D
C. +1.0 D
D. +2.0 D
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