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  2. Prism correction - Wikipedia

    en.wikipedia.org/wiki/Prism_correction

    Prism lenses (here unusually thick) are used for pre-operative prism adaptation. Eye care professionals use prism correction as a component of some eyeglass prescriptions. A lens which includes some amount of prism correction will displace the viewed image horizontally, vertically, or a combination of both directions.

  3. Corrective lens - Wikipedia

    en.wikipedia.org/wiki/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. Zenni Optical - Wikipedia

    en.wikipedia.org/wiki/Zenni_Optical

    The company sells more than 2,000 types of prescription glasses and sunglasses but does not sell contact lenses. Zenni created theme glasses through collaborations with professional gamers, sportspeople, the designer Iris Apfel and the actress Rashida Jones.

  5. Prism cover test - Wikipedia

    en.wikipedia.org/wiki/Prism_Cover_Test

    The prism cover test ( PCT) is an objective measurement and the gold standard in measuring strabismus, i.e. ocular misalignment, or a deviation of the eye. [1] It is used by ophthalmologists and orthoptists in order to measure the vertical and horizontal deviation and includes both manifest and latent components. [1]

  6. Eyeglass prescription - Wikipedia

    en.wikipedia.org/wiki/Eyeglass_prescription

    Positive meniscus lenses provide positive diopters, while negative meniscus lenses provide negative diopters. Every corrective lens prescription includes a spherical correction in diopters . Convergent powers are positive (e.g., +4.00 D) and condense light to correct for farsightedness/long-sightedness ( hyperopia ) or allow the patient to read ...

  7. History of photographic lens design - Wikipedia

    en.wikipedia.org/wiki/History_of_photographic...

    The first inverted telephoto imaging lens was the Taylor, Taylor & Hobson 35mm f/2 (1931, UK) developed to provide back-focus space for the beamsplitter prism used by the full-color via three negatives Technicolor motion picture camera.

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