contract the eyeball to achieve the proper focal distance. Unlike a camera,
out-of-focus pictures from the eye can be the result of four different
problems.
Figure 1.
Eye structure.
a. Myopia. This out-of-focus condition results when the eye is unable
to contract to the required focal length for a clear picture (Figure 2) and
is commonly referred to as nearsightedness.
Figure 2.
Myopia.
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