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  2. Mamiya 645 - Wikipedia

    en.wikipedia.org/wiki/Mamiya_645

    Prism viewfinder N [27] No 0.79x None N/A N/A N/A N/A N/A Camera No N/A None No Blocky shape from 645 Super, plain prism finder with no prominent knobs Prism viewfinder FP401 [28] No 0.79x None N/A N/A N/A N/A N/A Camera No N/A None No Smooth shape from 645 Pro and Pro TL, plain prism finder with no prominent knobs AE Prism viewfinder N [27] No ...

  3. Autorefractor - Wikipedia

    en.wikipedia.org/wiki/Autorefractor

    The majority of autorefractors calculate the vision correction a patient needs (refraction) by using sensors that detect the reflections from a cone of infrared light. These reflections are used to determine the size and shape of a ring in the retina which is located in the posterior part of the eye.

  4. Progressive lens - Wikipedia

    en.wikipedia.org/wiki/Progressive_lens

    Progressive lenses are corrective lenses used in ... thus explaining the difference in price. In short, the price is based on the technology used and the year the ...

  5. Prism (geometry) - Wikipedia

    en.wikipedia.org/wiki/Prism_(geometry)

    In geometry, a prism is a polyhedron comprising an n-sided polygon base, a second base which is a translated copy (rigidly moved without rotation) of the first, and n other faces, necessarily all parallelograms, joining corresponding sides of the two bases.

  6. Canon New F-1 - Wikipedia

    en.wikipedia.org/wiki/Canon_New_F-1

    The Canon New F-1 replaced the F-1n (an upgraded F-1) as Canon's top-of-the-line 35mm single-lens reflex camera in September 1981. Like the earlier models, the New F-1 takes FD-mount lenses.

  7. Cyclotropia - Wikipedia

    en.wikipedia.org/wiki/Cyclotropia

    Cyclotropia cannot be corrected with prism spectacles in the way other eye position disorders are corrected. [12] (Nonetheless two Dove prisms can be employed to rotate the visual field in experimental settings.) For cyclodeviations above 5 degrees, surgery has normally been recommended. [13]

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