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  2. Vivitar lenses - Wikipedia

    en.wikipedia.org/wiki/Vivitar

    Vivitar Corporation is a manufacturer, distributor, and marketer of photographic and optical equipment originally based in Santa Monica, California. [citation needed] Since 2008, the Vivitar name serves as Sakar International's house brand for digital imaging, optics, mobile accessories, and audio products.

  3. Corrective lens - Wikipedia

    en.wikipedia.org/wiki/Corrective_lens

    A contact lens rests directly on the surface of the cornea and moves in sync with all eye movements; consequently, a contact lens is always almost perfectly aligned on center with the pupil, and there is never any significant off-axis misalignment between the pupil and the optical center of the lens.

  4. AC Lens - Wikipedia

    en.wikipedia.org/wiki/AC_Lens

    In 2000, AC Lens acquired I-Ohio LLC in an exchange of private stock. [2] AC Lens now operates various websites including USA and United Kingdom based sites. Dr. Clarkson is a graduate of Southampton University in the UK and the Ohio State University College of Medicine. On February 4, 2004, the Fairness to Contact Lens Consumers Act went into ...

  5. Rigid gas permeable lens - Wikipedia

    en.wikipedia.org/wiki/Rigid_gas_permeable_lens

    A rigid gas-permeable lens, also known as an RGP lens, GP lens, or colloquially, a hard contact lens, is a rigid contact lens made of oxygen-permeable polymers. Initially developed in the late 1970s, and through the 1980s and 1990s, they were an improvement over prior 'hard' lenses that restricted oxygen transmission to the eye.

  6. Oxygen permeability - Wikipedia

    en.wikipedia.org/wiki/Oxygen_permeability

    Oxygen permeability (OP) is a parameter of a contact lens that expresses the ability of the lens to let oxygen reach the eye by diffusion.In soft contact lenses, it is dependent on the thickness of the lens and the material of the lens, especially concerning the water content.

  7. Intraocular lens - Wikipedia

    en.wikipedia.org/wiki/Intraocular_lens

    Effective IOL implants also eliminate the need for glasses or contact lenses post-surgery for most patients. [5] Cataracts will not appear or return, as the lens has been removed. The disadvantage is that the eye's ability to change focus (accommodate) has generally been reduced or eliminated, depending on the kind of lens implanted. [citation ...

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