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accommodation occurs. Visual accommodation is the process of changing the curvature of the
lens to keep the light entering the eye focused on the retina. Rays from the top of the image strike
the bottom of the retina and vice versa, and rays from the left side of the image strike the right
part of the retina and vice versa, causing the image on the retina to be upside down and
backward. Furthermore, the image projected on the retina is flat, and yet our final perception of
the image will be three dimensional.
Figure 4.7 Anatomy of the Human Eye