What would you see if you had one eye on the back of your head and the other in the front?

An optometrist answers a young reader's question about what vision would look like with one eye in front and one in back, explaining that human forward-facing eyes provide roughly 180 degrees of overlapping field of view enabling depth perception, or stereopsis. Predators like foxes have forward-facing eyes for hunting, while prey animals like rabbits have side-set eyes for wider peripheral awareness at the cost of sharper depth perception.

Owls are noted as an exception, combining forward-facing eyes for depth perception with extremely mobile necks that let them turn their heads nearly backward for a wider field of view. A human with one eye front and one back would gain a rabbit-like wide field of view but lose stereo depth perception, and the sudden switch would initially confuse the brain's image processing.

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