Refractive State of the Eye of a Small Diurnal Mammal

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Abstract
Whether or not the eyes of small mammals are hyperopic was previously studied in nocturnal animals such as the rat. The refractive state of the eye of a small diurnal mammal, the ground squirrel, was measured by retinoscopy and the electrophysiological response of retinal ganglion cells to grating targets. Both measurements show the squirrel was emmetropic. The refractive state of the eye apparently is not a function of eye size per se, but rather a function of whether the animal is nocturnal or diurnal.

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