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  2. Optics and vision - Wikipedia

    en.wikipedia.org/wiki/Optics_and_vision

    A corrective lens is a lens worn in front of the eye, mainly used to treat myopia, hyperopia, astigmatism, and presbyopia. The goal is to bring vision up to 20/20 vision or as close to this as possible. Glasses or "spectacles" are corrective lenses worn on the face a short distance in front of the eye.

  3. Color blind glasses - Wikipedia

    en.wikipedia.org/wiki/Color_blind_glasses

    Tinted lenses (e.g. Pilestone [6] /Colorlite [7] /ColorMax [8] glasses) apply a tint (e.g. magenta) to incoming light that can distort colors in a way that makes some color tasks easier to complete. These glasses can circumvent many colorblind tests, though wearing them during testing is typically not allowed.

  4. Corrective lens - Wikipedia

    en.wikipedia.org/wiki/Corrective_lens

    Higher-quality optical-grade glass materials exist (e.g. Borosilicate crown glasses such as BK7 ( n d = 1.51680 , V d = 64.17 , D = 2.51 g/cm³ ), which is commonly used in telescopes and binoculars, and fluorite crown glasses such as the best optical quality low dispersion glass currently in production, N-FK58 made by the German company Schott ...

  5. Glasses - Wikipedia

    en.wikipedia.org/wiki/Glasses

    Glasses, also known as eyeglasses or spectacles, are vision eyewear with clear or tinted lenses mounted in a frame that holds them in front of a person's eyes, typically utilizing a bridge over the nose and hinged arms, known as temples or temple pieces, that rest over the ears for support.

  6. EnChroma - Wikipedia

    en.wikipedia.org/wiki/EnChroma

    EnChroma lenses are composed primarily of an optical notch filter that selectively filters wavelengths of light in the part of the spectrum where the M- and L-opsin sensitivities overlap, namely 530-560 nm, thereby removing light that excites both opsin types and decorrelating the signals between the M- and L-cones.

  7. Refractive error - Wikipedia

    en.wikipedia.org/wiki/Refractive_error

    Eyeglasses are the easiest and safest method of correction. Contact lenses can provide a wider field of vision ; however they are associated with a risk of infection. Refractive surgery may consist of either permanently changing the shape of the cornea or, alternatively, implanting intraocular lenses .

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