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2. Ophthalmic trial frame - Wikipedia

   en.wikipedia.org/wiki/Ophthalmic_trial_frame

   Angle for axis of astigmatism is marked on outermost visible cell There are knobes to adjust pupillary distance, side angle, height and cylindrical lens axis. [5] The nosepiece assembly can be moved front-back and up-down for correct positioning of the lenses in front of the eyes. [5] The length of the legs can also be adjusted. [5]

3. History of optics - Wikipedia

   en.wikipedia.org/wiki/History_of_optics

   Modern ophthalmic lens making machine. Optics began with the development of lenses by the ancient Egyptians and Mesopotamians, followed by theories on light and vision developed by ancient Greek philosophers, and the development of geometrical optics in the Greco-Roman world.

4. Talk:Prism correction - Wikipedia

   en.wikipedia.org/wiki/Talk:Prism_correction

   ADDITION: Should I assume that prism correction is unavailable to contact lens wearers? Thanks, Wordreader 18:17, 12 August 2015 (UTC) I'm sorry, make that "Crizal", not Crizol. Is the "fresnel prism" used in eyeglasses the same as this kind of prism? Thanks again, Wordreader 02:42, 15 August 2015 (UTC)

5. Aspheric lens - Wikipedia

   en.wikipedia.org/wiki/Aspheric_lens

   The lenses' "minus" powers reduce the test pattern and bring it into better focus at the center of the lenses. Reflections from the non-aspheric anterior surfaces are also visible. Like other lenses for vision correction, aspheric lenses can be categorized as convex or concave.

6. Optical coating - Wikipedia

   en.wikipedia.org/wiki/Optical_coating

   The unwanted interference effects are suppressed by vapour-depositing a special dielectric coating known as a phase-compensating coating on the roof surfaces of the roof prism. These phase-correction coating or P-coating on the roof surfaces was developed in 1988 by Adolf Weyrauch at Carl Zeiss [6] Other manufacturers followed soon, and since ...

7. Fresnel lens - Wikipedia

   en.wikipedia.org/wiki/Fresnel_lens

   In some lenses, the curved surfaces are replaced with flat surfaces, with a different angle in each section. Such a lens can be regarded as an array of prisms arranged in a circular fashion with steeper prisms on the edges and a flat or slightly convex center. In the first (and largest) Fresnel lenses, each section was actually a separate prism.