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From Biology-Online Dictionary | Biology-Online Dictionary
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1. An eye in which the iris is of a very light gray or whitish colour; said usually of horses.

Jonson has defined wall-eye to be a disease in the crystalline humor of the eye; glaucoma. But glaucoma is not a disease of the crystalline humor, nor is wall-eye a disease at all, but merely a natural blemish. In the north of England, as Brockett states, persons are said to be wall-eyed when the white of the eye is very large and distorted, or on one side.

2. (Science: zoology) An American fresh water food fish (Stizostedion vitreum) having large and prominent eyes; called also glasseye, pike perch, yellow pike, and wall-eyed perch. A California surf fish (Holconotus argenteus).

The alewife; called also wall-eyed herring.

See: wall-eyed.