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Why are eye transplants not available?

It is because the eye's retina is part of the brain, and the retina's cells are derived from brain tissue. Retinal cells and the cells that connect them to the brain are the least amenable to being manipulated outside the body.


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Actually it's because it they were, then the running Red Ryder BB gun theme in 'A Christmas Story' wouldn't be nearly as funny. Not that it's funny now. Nevermind.