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2. PRISM - Wikipedia

   en.wikipedia.org/wiki/PRISM

   PRISM is a code name for a program under which the United States National Security Agency (NSA) collects internet communications from various U.S. internet companies ...

3. Wedge prism - Wikipedia

   en.wikipedia.org/wiki/Wedge_prism

   The wedge prism is a prism with a shallow angle between its input and output surfaces. This angle is usually 3 degrees or less. Refraction at the surfaces causes the prism to deflect light by a fixed angle. When viewing a scene through such a prism, objects will appear to be offset by an amount that varies with their distance from the prism.

4. Binoculars - Wikipedia

   en.wikipedia.org/wiki/Binoculars

   8×42 roof prism binoculars with rainguard and opened tethered lens caps. Binoculars or field glasses are two refracting telescopes mounted side-by-side and aligned to point in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects.

5. Upside down goggles - Wikipedia

   en.wikipedia.org/wiki/Upside_down_goggles

   How a human looks blinking in upside down goggles. Under normal circumstances, an inverted image is formed on the retina of the eye. With the help of upside down goggles, the image on the retina of the observer's eyes is turned back (straightened) and thus the space around the observer looks upside down.

6. Fixation disparity - Wikipedia

   en.wikipedia.org/wiki/Fixation_disparity

   Experimental evidence for the effectiveness of the aligning prism came from a study of reading speed and corresponding preferences of prism eye glasses. [40] A different approach was suggested by H.-J. Haase [ 5 ] [ 41 ] who proposed a set of dichoptic target tests with both central and more peripheral fusion targets and additional stereo tests ...

7. Prism adaptation - Wikipedia

   en.wikipedia.org/wiki/Prism_Adaptation

   Prism adaptation is a sensory-motor adaptation that occurs after the visual field has been artificially shifted laterally or vertically. It was first introduced by Hermann von Helmholtz in late 19th-century Germany as supportive evidence for his perceptual learning theory (Helmholtz, 1909/1962). [1]