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  2. Ultrawide formats - Wikipedia

    en.wikipedia.org/wiki/Ultrawide_formats

    Ultrawide formats refers to photos, videos, [ 1] and displays [ 2] with aspect ratios greater than 2. There were multiple moves in history towards wider formats, including one by Disney, [ 3] with some of them being more successful than others. Cameras usually capture ultra-wide photos and videos using an anamorphic format lens, which shrinks ...

  3. Ultra-high-definition television - Wikipedia

    en.wikipedia.org/wiki/Ultra-high-definition...

    Ultra-high-definition television (also known as Ultra HD television, Ultra HD, UHDTV, UHD and Super Hi-Vision) today includes 4K UHD and 8K UHD, which are two digital video formats with an aspect ratio of 16:9. These were first proposed by NHK Science & Technology Research Laboratories and later defined and approved by the International ...

  4. Corrective lens - Wikipedia

    en.wikipedia.org/wiki/Corrective_lens

    Corrective lens. A corrective lens is a transmissive optical device that is worn on the eye to improve visual perception. The most common use is to treat refractive errors: myopia, hypermetropia, astigmatism, and presbyopia. Glasses or "spectacles" are worn on the face a short distance in front of the eye.

  5. List of computer display standards - Wikipedia

    en.wikipedia.org/wiki/List_of_computer_display...

    Full High Definition (1080p) This display aspect ratio is the native resolution for many 24" widescreen LCD monitors, and is expected to also become a standard resolution for smaller-to-medium-sized wide-aspect tablet computers in the near future (as of 2012). 1920×1080 (2,073k) 1920 1080 2,073,600 16:9 24 bpp DCI 2K: Digital Cinema Initiatives 2K

  6. CR-39 - Wikipedia

    en.wikipedia.org/wiki/CR-39

    Poly (allyl diglycol carbonate) (PADC) is a plastic commonly used in the manufacture of eyeglass lenses alongside the material PMMA ( polymethyl methacrylate ). The monomer is allyl diglycol carbonate (ADC). The term CR-39 technically refers to the ADC monomer, but is more commonly used to refer to the finished plastic.

  7. Visual acuity - Wikipedia

    en.wikipedia.org/wiki/Visual_acuity

    Eye examination for visual acuity. Visual acuity is a measure of the spatial resolution of the visual processing system. VA, as it is sometimes referred to by optical professionals, is tested by requiring the person whose vision is being tested to identify so-called optotypes – stylized letters, Landolt rings, pediatric symbols, symbols for the illiterate, standardized Cyrillic letters in ...

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