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  2. Eyeglass prescription - Wikipedia

    en.wikipedia.org/wiki/Eyeglass_prescription

    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.

  3. Fairness to Contact Lens Consumers Act - Wikipedia

    en.wikipedia.org/wiki/Fairness_to_Contact_Lens...

    Fairness to Contact Lens Consumers Act; Long title: An act to provide for availability of contact lens prescriptions to patients, and for other purposes. Enacted by: the 108th United States Congress: Effective: 4 February 2004: Citations; Public law: Pub. L. Tooltip Public Law (United States) 108–164 (text) Statutes at Large: 117 Stat. 2024 ...

  4. Vertex distance - Wikipedia

    en.wikipedia.org/wiki/Vertex_distance

    The axis value does not change with vertex distance, so the equivalent prescription for a contact lens (vertex distance, 0 mm) is −7.30 D of sphere, −4.13 D of cylinder with 85° of axis (−7.30 −4.13×85 or about −7.25 −4.25×85). Example 2: example prescription adjustment from contacts to glasses

  5. Optics and vision - Wikipedia

    en.wikipedia.org/wiki/Optics_and_vision

    The prescription consists of all the specifications necessary to make the lens. Prescriptions typically include the power specifications of each lens (for each eye). Strengths are generally prescribed in quarter-diopter steps (0.25 D) because most people cannot generally distinguish between smaller increments (ex. eighth-diopter steps / 0.125 D).

  6. Contact lens - Wikipedia

    en.wikipedia.org/wiki/Contact_lens

    Contact lenses, or simply contacts, are thin lenses placed directly on the surface of the eyes. Contact lenses are ocular prosthetic devices used by over 150 million people worldwide, [1] and they can be worn to correct vision or for cosmetic or therapeutic reasons. [2]

  7. 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.

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