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Eyes come in all sizes. These belong to a domestic cat (from left), an owl and an octopus. The Comparative Ocular Pathology Laboratory of Wisconsin has 56,000 specimens in its collection — including 6,000 from more exotic species. From left: Andyworks, Ralf Hettler, vicmicallef/iStockPhoto hide caption

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From left: Andyworks, Ralf Hettler, vicmicallef/iStockPhoto

'One Of A Kind' Collection Of Animal Eyeballs Aids Research On Vision Problems

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