Answer Happy

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 pe 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. Part A Suppose a woman has a far point of 45 cm . How much should the refractive power of her cornea be changed to correct her vision? 0 -2.2 D 0 -1.1 D O 0 1.1 D 2.2 D Submit Request Answer