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In the remarkable genus Anableps, from Central and South America, the strongly projecting eyes are divided by a horizontal band of the conjunctiva into an upper part adapted for vision in the air, and a lower for vision in the water, and the pupil is also divided into two parts by a constriction.

Anableps, an′a-bleps, n. a genus of bony fishes with open air-bladders, and projecting eyes divided into an upper and lower portion, so that each eye has two pupils.

That playground taunt is more accurate when applied to Anableps anableps—a fish related to the guppy.

Anableps doesn't actually have four eyes—just the usual two.

We see the barreleye fish, whose eyes extend from its head on tubes, Anableps anableps, a fish with four eyes, and the mantis fish whose color vision is so acute, Dr. Knowlton writes, that it makes what we see look like it is “practically in black and white.”