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2. Polaroid Eyewear - Wikipedia

   en.wikipedia.org/wiki/Polaroid_Eyewear

   Polaroid Eyewear manufactures polarized sunglasses and polarized lenses, as well as optical frames, reading glasses, and clip-on lenses. Polaroid Eyewear was a part of the StyleMark group and sold to the Safilo Group in November 2011. Polaroid headquarters is located in Padua (Italy).

3. Sunglasses - Wikipedia

   en.wikipedia.org/wiki/Sunglasses

   Some models have polarized lenses, made of Polaroid polarized plastic sheeting, to reduce glare caused by light reflected from non-metallic surfaces such as water (see Brewster's angle for how this works) as well as by polarized diffuse sky radiation (skylight). This can be especially useful to see beneath the surface of the water when fishing.

4. Luxottica - Wikipedia

   en.wikipedia.org/wiki/Luxottica

   The new entity will be worth around $50bn (£37bn), sell close to a billion pairs of lenses and frames every year, and have a workforce of more than 140,000 people." [ 34 ] On 1 October 2018 the new holding company EssilorLuxottica was founded, resulting in combined market capitalization of approximately €46.3 billion as of the date of the ...

5. Glasses - Wikipedia

   en.wikipedia.org/wiki/Glasses

   Man with glasses. A woman with glasses. Glasses, also known as eyeglasses, spectacles, or colloquially as specs, are vision eyewear with clear or tinted lenses mounted in a frame that holds them in front of a person's eyes, typically utilizing a bridge over the nose and hinged arms, known as temples or temple pieces, that rest over the ears for support.

6. List of refractive indices - Wikipedia

   en.wikipedia.org/wiki/List_of_refractive_indices

   Refraction at interface. Many materials have a well-characterized refractive index, but these indices often depend strongly upon the frequency of light, causing optical dispersion.

7. Refractive index - Wikipedia

   en.wikipedia.org/wiki/Refractive_index

   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. If the refractive index of a medium is not constant but varies gradually with the position, the material is known as a gradient-index (GRIN) medium and is described by gradient index ...