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Abstract
Measurements of the arteriovenous oxygen difference across the uveal tract of the living dog eye were made by taking venous blood from the anterior ciliary vein. Values were found in the range of A to .9 vol. % oxygen for the AV difference. This is one of the lowest, if not the lowest, AV oxygen difference for any organ of the dog. The low value was found, in normal eyes, eyes with uveitis, eyes in which other venous channels were tied off, and at greatly different rates of collection of blood. It is suggested that shunting of blood through large capillaries in the ciliary processes could be a mechanism which explains this low AV oxygen difference.