http://en.wikipedia.org/wiki/Eye
For a human eye with excellent acuity, the maximum theoretical resolution is 50 CPD(1.2 arcminute per line pair, or a 0.35 mm line pair, at 1 m). A rat can resolve only about 1 to 2 CPD.A horse has higher acuity through most of the visual field of its eyes than a human has, but does not match the high acuity of the human eye's central fovea region.
For a human eye with excellent acuity, the maximum theoretical resolution is 50 CPD(1.2 arcminute per line pair, or a 0.35 mm line pair, at 1 m). A rat can resolve only about 1 to 2 CPD.A horse has higher acuity through most of the visual field of its eyes than a human has, but does not match the high acuity of the human eye's central fovea region.
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