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I'm John Betts with Mary Roach, the author, and her new book is Replaceable You.

It's futuristic. It's also at the same time heartening for those who've had surgery and concern themselves with their appearance afterwards.

We come now to donors, that is, the widow and the children of a deceased coal miner, for example,

or any gentleman or mother who's gone. What do you need to know about what the needs are and what happens? Let's start with

the eyes, Mary. They need eyes from cadavers. You can actually replace a human eye with a human eye

of a deceased person. Is that correct? The cornea. No, no one is transplanting entire eyes.

And the eye, the optic nerve is, it's really part of the brain.

So it's, it would be a, that's, that's a tricky one to replace.

But the cornea, which is the very, very thin layer on the exterior of the eye, which can be removed and can be

transplanted.

There are certain diseases.

Fuchs dystrophy is one of them where a corneal transplant is the most common treatment

for that.

...