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"The bottom line in the Dune trilogy is: beware of heroes. Much better to rely on your own judgment, and your own mistakes."
- Frank Herbert

Microscreen  
  An immaterial protective helmet.  

You never know what kinds of pathogens are floating around in the atmosphere; better to have a protective screen.

DOCTOR Kessler peered at him through the microscreen. It gave his face a narrow insubstantial appearance. The microscreen was a hemispherical force field enclosing his head. It originated in a tubular circlet that snapped around his throat at the top of the decontagion suit. The field killed all microlife that passed through it or came in contact with it. The decontagion suit was non-porous and impermeable, covering completely the rest of his body. The material was thinner over his hands and thicker at the soles...

The microscreen distorted sound as well as sight.

Technovelgy from Bolden's Pets, by F.L. Wallace.
Published by Galaxy in 1955
Additional resources -

Compare to the transparent dome helmet from The Man from the Atom (1926) by G. Peyton Wertenbaker, the to space helmet from The Disc-Men of Jupiter (1931) by Manly Wade Wellman, the space-helmet from The Sargasso of Space (1931) by Edmond Hamilton and globular glass helmet from Murder on the Asteroid (1933) by Eando Binder.

See also the breathing balloon from Get a Horse! (1969) by Larry Niven.

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Additional resources:
  More Ideas and Technology from Bolden's Pets
  More Ideas and Technology by F.L. Wallace
  Tech news articles related to Bolden's Pets
  Tech news articles related to works by F.L. Wallace

Microscreen-related news articles:
  - Taza Aya Air-Curtain Tech Protects Turkey Workers

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