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  2. Helios (lens brand) - Wikipedia

    en.wikipedia.org/wiki/Helios_(lens_brand)

    Helios 44-2 lens mounted on a Praktica MTL 5B Helios 44M-4 lens, 58mm f/2, in M42 screw mount Helios 40-2 Helios 81M 53mm f/2 lens mounted on Kiev 19. Helios (Russian: Ге́лиос) was a type of camera lenses, made in the USSR. They were usually supplied with Zenit cameras and thus usable with other M42 lens mount cameras such as the Pentax ...

  3. Canon EF lens mount - Wikipedia

    en.wikipedia.org/wiki/Canon_EF_lens_mount

    Number of Canon EF lenses sold over time (red), compared with Nikon F mount lenses (blue) The EF mount replaces its predecessor, the FD mount.The standard autofocus lens mounting technology of the time used a motor in the camera body to drive the mechanics of the focus helicoid in the lens by using a transfer lever.

  4. Eyeglass prescription - Wikipedia

    en.wikipedia.org/wiki/Eyeglass_prescription

    Using a phoropter to determine a prescription for eyeglasses. An eyeglass prescription is an order written by an eyewear prescriber, such as an optometrist, that specifies the value of all parameters the prescriber has deemed necessary to construct and/or dispense corrective lenses appropriate for a patient.

  5. Barcode - Wikipedia

    en.wikipedia.org/wiki/Barcode

    Williams also developed Code 128, and the structure of 16K is based on Code 128. Not coincidentally, 128 squared happened to equal 16,384 or 16K for short. Code 16K resolved an inherent problem with Code 49. Code 49's structure requires a large amount of memory for encoding and decoding tables and algorithms. 16K is a stacked symbology. [41] [42]

  6. Lens - Wikipedia

    en.wikipedia.org/wiki/Lens

    A burning apparatus consisting of two biconvex lens. A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction.A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses (elements), usually arranged along a common axis.

  7. America's Best Contacts & Eyeglasses - Wikipedia

    en.wikipedia.org/wiki/America's_Best_Contacts...

    America's Best Contacts & Eyeglasses is a discount provider of eye examinations, eyeglasses and contact lenses, with over 1000 retail locations in the United States as of May 31, 2024. The millennial store is located in Philadelphia, PA, which happened to be one of National Vision's first markets in their early days over 40 years ago.

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