four-eyed fish

(Animals) either of two viviparous tropical American freshwater cyprinodont fishes, Anableps anableps or A. microlepis, that swim at the surface of the water and have half of each eye specialized for seeing in air, the other half for seeing in water

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

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So-called four-eyed fish double each of their two eyes, one half better tuned to seeing above water and the other better for below the surface.

Strange visions: the study of animal sight takes a turn toward the bizarre

ZOOLOGISTS are celebrating after a pair of rare four-eyed fish were born at their aquarium.

Four-eyed fish are a welcome spectacle

"What makes this animal so unusual is that each eye is divided into two parts, one pointing upwards and one pointing downward, making it look like it has four eyes, and four-eyed fish don't exist," says Frank.