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"You have to budget the number of fuzzy rules you use to control a system. It turns out, you can state the optimality principle in three words: 'patch the bumps.'"
- Bart Kosko

Visor  
  A snap-down video screen for your eyes only.  

"Happiness is transient," Rickenharp muttered as he flipped the visorclip back. The visor looked like the strap-and-mirror affairs that doctors wore, only the screen that snapped down over the eyes was rectangular, like a rear view mirror.
From Freezone, by John Shirley.
Published by Eclipse in 1985
Additional resources -

See also the fieldstim device from the same story.

The author refers to the circular "bullseye" mirror that was a standard part of a general practitioner's equipment through the 1950's. To use it, the doctor swung it down over one eye, and then looked through the hole in the center into the patient's nose or throat; reflected ambient light improved the view.

I remember these from my childhood encounters with physicians; if the doctor had a poor bedside manner with children, adding a giant reflective eye in the center of his forehead did not improve matters.

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Additional resources:
  More Ideas and Technology from Freezone
  More Ideas and Technology by John Shirley
  Tech news articles related to Freezone
  Tech news articles related to works by John Shirley

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