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2. Randolph Engineering - Wikipedia

   en.wikipedia.org/wiki/Randolph_Engineering

   Randolph Engineering produces shooting eyewear, sunglasses, and prescription eyewear. Their products come in a variety of lens and frame styles, the most popular being the traditional aviator style. Each pair of sunglasses is made nearly entirely by hand in a detailed 200-step process. [11] An average of 53,000 pairs of glasses are produced per ...

3. Ray-Ban - Wikipedia

   en.wikipedia.org/wiki/Ray-Ban

   Website. ray-ban .com. Ray-Ban is a brand of luxury sunglasses and eyeglasses created in 1936 by Bausch & Lomb. The brand is best known for its Wayfarer and Aviator lines of sunglasses. In 1999, Bausch & Lomb sold the brand to Italian eyewear conglomerate Luxottica Group for a reported $640 million. [ 1][ 2]

4. Sunglasses - Wikipedia

   en.wikipedia.org/wiki/Sunglasses

   A mirror coating does not get hot in sunlight and it prevents scattering of rays in the lens bulk. Sunglass lenses are made of either glass, plastic, or SR-91. Plastic lenses are typically made from acrylic, polycarbonate, CR-39 or polyurethane. Glass lenses have the best optical clarity and scratch resistance, but are heavier than plastic lenses.

5. Anti-reflective coating - Wikipedia

   en.wikipedia.org/wiki/Anti-reflective_coating

   Uncoated glasses lens (top) versus lens with anti-reflective coating. The reflection from the coated lens is tinted because the coating works better at some wavelengths than others. An antireflective , antiglare or anti-reflection ( AR ) coating is a type of optical coating applied to the surface of lenses , other optical elements, and ...

6. Adjustable-focus eyeglasses - Wikipedia

   en.wikipedia.org/wiki/Adjustable-focus_eyeglasses

   Adjustable-focus eyeglasses. Adjustable focus eyeglasses are eyeglasses with an adjustable focal length. They compensate for refractive errors (such as presbyopia) by providing variable focusing, allowing users to adjust them for desired distance or prescription, or both. Current bifocals and progressive lenses are static, in that the user has ...

7. Gradient-index optics - Wikipedia

   en.wikipedia.org/wiki/Gradient-index_optics

   Gradient-index optics. A gradient-index lens with a parabolic variation of refractive index ( n) with radial distance ( x ). The lens focuses light in the same way as a conventional lens. Gradient-index ( GRIN) optics is the branch of optics covering optical effects produced by a gradient of the refractive index of a material.