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Visual Acuity: the sharpness of vision ( the eye checkup chart. . big size at  the top and the leters get smaller as you go lower on the chart. .) simulations. . 3 months. . just see outlines no details. . 6 months. . more  contrast n see some patterns. 9 months looks like adults vision but not soo  sharp. .) s Contrast sensitivity: Infants have poor contrast sensitivity; they can see patterns  only when composed of highly contrasting elements. visual acuity tests. . the gray background and contrast on the stripes patterns. Why does vision improve?   Reason 1: changes in the size, shape, and arrangement of the cones (neural  cells that aid in color and detail perception) are still developing. picture in notes. . light goes thru the black holes. . adults have more condensed  and thinner holes. The infants have big thick cones, doesn't allow much light to  penetrate. .   Reason 2 - the lens (muscles that develop the lens needs to be developed to 
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