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"Building one space station for everyone was and is insane: we should have built a dozen."
- Larry Niven

Optic Prosthesis  
  A replacement for a damaged eye.  

In the novel, Mark Marakson is a misunderstood engineer in a world full of magic, a world parallel to our own in which science had been discarded. Attacked by the mob and disfigured, he is healed by the ancient machines.

How long had it been - four, five, six days? - since the robo-surgeon had worked him over?

He raised his head. The room was dark. The thing which protruded from his left eyesocket hummed. Finally, it grew silent and he had vision on that side.

He... regarded himself in the mirror... He tapped lightly with his fingertips above the perimeter of the lens case, where it joined his brow and cheekbone...

One of the small, gnarled men... sat before a bank of glowing screens... As he approached, his optic prosthesis hummed, its lens becoming a greenish color as it adjusted to the lighting...

The small man stole a glance at him.

"I must say, sir. The new eye-thing is most attractive..."

From Changeling, by Roger Zelazny.
Published by Ace in 1980
Additional resources -

The idea of an implantable, artificial eye is probably one of humankind's older dreams. In science fiction, you can go back to E.E. 'Doc' Smith's 1937 novel Galactic Patrol, if not further; see the artificial eye.

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Additional resources:
  More Ideas and Technology from Changeling
  More Ideas and Technology by Roger Zelazny
  Tech news articles related to Changeling
  Tech news articles related to works by Roger Zelazny

Optic Prosthesis-related news articles:
  - Implantable Prosthetic For The Blind

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