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"Science Fiction is speculative fiction in which the author takes as his first postulate the real world as we know it, including all established facts and natural laws."
- Robert Heinlein

Sunshades  
  Sunglasses that darken and lighten based on ambient lighting.  

Red Wig walked tall, tiny beads of perspiration seasoning her upper lip, eyes hidden behind sunshades which had darkened themselves as much as they could.
From This Immortal, by Roger Zelazny.
Published by Ace Science Fiction in 1966
Additional resources -

Photochromic glass were developed by Corning in the early 1960's; they contain a layer of material that will darken when exposed to ultraviolet rays.

I still think that this use is a good example of how science fiction can promote a use for technology before it becomes generally available. Glasses that contained this material were not commercially available until the mid-1970's.

Compare this idea to the polawindows from Frank Herbert's 1972 novel The Godmakers.

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

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