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2. Roof prism - Wikipedia

   en.wikipedia.org/wiki/Roof_prism

   Roof prism. A roof pentaprism used in Single-lens reflex cameras; the lower right face is the roof ( dach ). A roof prism, also called a Dachkanten prism or Dach prism (from German: Dachkante, lit. "roof edge"), is a reflective prism containing a section where two faces meet at a 90° angle, resembling the roof of a building and thus the name.

3. Dioptre - Wikipedia

   en.wikipedia.org/wiki/Dioptre

   A dioptre ( British spelling) or diopter ( American spelling ), symbol dpt, is a unit of measurement with dimension of reciprocal length, equivalent to one reciprocal metre, 1 dpt = 1 m−1. It is normally used to express the optical power of a lens or curved mirror, which is a physical quantity equal to the reciprocal of the focal length ...

4. Aberrations of the eye - Wikipedia

   en.wikipedia.org/wiki/Aberrations_of_the_eye

   Aberrations of the eye. The eye, like any other optical system, suffers from a number of specific optical aberrations. The optical quality of the eye is limited by optical aberrations, diffraction and scatter. [1] Correction of spherocylindrical refractive errors has been possible for nearly two centuries following Airy's development of methods ...

5. Munsell color system - Wikipedia

   en.wikipedia.org/wiki/Munsell_color_system

   The Munsell color system, showing: a circle of hues at value 5 chroma 6; the neutral values from 0 to 10; and the chromas of purple-blue (5PB) at value 5. In colorimetry, the Munsell color system is a color space that specifies colors based on three properties of color: hue (basic color), value ( lightness ), and chroma (color intensity).

6. Horror fusionis - Wikipedia

   en.wikipedia.org/wiki/Horror_fusionis

   Ophthalmology. In ophthalmology, horror fusionis is a condition in which the eyes have an unsteady deviation, with the extraocular muscles performing spasm-like movements that continuously shift the eyes away from the position in which they would be directed to the same point in space, giving rise to diplopia. Even when the double vision images ...

7. Spaceship Superstar - Wikipedia

   en.wikipedia.org/wiki/Spaceship_Superstar

   Spaceship Superstar. " Spaceship Superstar " is the first official single by the Canadian rock band Prism. The song was written by Jim Vallance. [2] [3] It was also the first single from the band's self-titled debut album. "Spaceship Superstar" reached No. 63 on the Canadian Singles Chart and No. 82 on the Billboard Hot 100 singles chart in the ...