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"Science and science fiction, how do you even distinguish the two?"
- Jerry Pournelle

Joo Janta 200 Super-Chromatic Peril Sensitive Sunglasses  
  Sunglasses that darken at the sight of danger.  

He... put on the sunglasses, annoyed to discover that the metal object had scratched one of the lenses. Nevertheless, he felt much more comfortable with them on. They were a double pair of Joo Janta 200 Super-Chromatic Peril Sensitive Sunglasses, which had been specially designed to help people develop a relaxed attitude toward danger. At the first hint of trouble they turn totally black and thus prevent you from seeing anything that might alarm you.
From The Hitchhiker's Guide to the Galaxy, by Douglas Adams.
Published by Harmony Books in 1979
Additional resources -

Compare to the also-handy GPS sunglasses from William Gibson's 1999 novel All Tomorrow's Parties. Thanks to an alert reader who anonymously pointed this out.

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Additional resources:
  More Ideas and Technology from The Hitchhiker's Guide to the Galaxy
  More Ideas and Technology by Douglas Adams
  Tech news articles related to The Hitchhiker's Guide to the Galaxy
  Tech news articles related to works by Douglas Adams

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