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  2. Lenses for SLR and DSLR cameras | Wikipedia

    en.wikipedia.org/wiki/Lenses_for_SLR_and_DSLR...

    Lenses for SLR and DSLR cameras. A collection of lenses a DSLR owner might have: 50mm F1.4, 17-40mm F4, 100mm F2.8 Macro, 24-70mm F2.8, 70-200mm F2.8. This article details lenses for single-lens reflex and digital single-lens reflex cameras (SLRs and DSLRs respectively). The emphasis is on modern lenses for 35 mm film SLRs and for "full-frame ...

  3. Corrective lens | Wikipedia

    en.wikipedia.org/wiki/Corrective_lens

    Corrective lens. A pair of contact lenses, positioned with the concave side facing upward. 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.

  4. Eyeglass prescription | Wikipedia

    en.wikipedia.org/wiki/Eyeglass_prescription

    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. Mark Zuckerberg unveils new Orion holographic smart glasses ...

    www.aol.com/finance/mark-zuckerberg-unveils...

    The holographic smart glasses use an entirely new type of display, Zuckerberg said as he donned them. "This is not pass-through, this is the real world with holograms overlaid on it," he said.

  6. List of Minolta A-mount lenses | Wikipedia

    en.wikipedia.org/wiki/List_of_Minolta_A-mount_lenses

    List of Minolta A-mount lenses Minolta and its successor Konica Minolta released the following lenses for Minolta A-mount cameras between 1985 and 2006.

  7. Adjustable-focus eyeglasses | Wikipedia

    en.wikipedia.org/wiki/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 to change their eye position ...

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