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  2. Prism correction - Wikipedia

    en.wikipedia.org/wiki/Prism_correction

    A lens which includes some amount of prism correction will displace the viewed image horizontally, vertically, or a combination of both directions. The most common application for this is the treatment of strabismus. By moving the image in front of the deviated eye, double vision can be avoided and comfortable binocular vision can be achieved ...

  3. Corrective lens - Wikipedia

    en.wikipedia.org/wiki/Corrective_lens

    Corrective lens. 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. Glasses or "spectacles" are worn on the face a short distance in front of the eye.

  4. Contact lens - Wikipedia

    en.wikipedia.org/wiki/Contact_lens

    A small number of hybrid lenses exist. Typically, these contact lenses consist of a rigid center and a soft "skirt". A similar technique is the "piggybacking" of a smaller, rigid lens on the surface of a larger, soft lens. These techniques are often chosen to give the vision correction benefits of a rigid lens and the comfort of a soft lens.

  5. Farsightedness - Wikipedia

    en.wikipedia.org/wiki/Farsightedness

    The signs and symptoms of far-sightedness include blurry vision, frontal or fronto temporal headaches, eye strain, tiredness of eyes etc. [2] The common symptom is eye strain. Difficulty seeing with both eyes ( binocular vision) may occur, as well as difficulty with depth perception. [1] The asthenopic symptoms and near blur are usually seen ...

  6. Subjective refraction - Wikipedia

    en.wikipedia.org/wiki/Subjective_refraction

    Subjective refraction. Subjective Refraction is a technique to determine the combination of lenses that will provide the best corrected visual acuity (BCVA). [1] It is a clinical examination used by orthoptists, optometrists and ophthalmologists to determine a patient's need for refractive correction, in the form of glasses or contact lenses.

  7. Monocle - Wikipedia

    en.wikipedia.org/wiki/Monocle

    Look up monocle in Wiktionary, the free dictionary. A monocle is a type of corrective lens used to correct or enhance the visual perception in only one eye. It consists of a circular lens placed in front of the eye and held in place by the eye socket itself. Often, to avoid losing the monocle, a string or wire is connected to the wearer's ...

  8. Lenticular lens - Wikipedia

    en.wikipedia.org/wiki/Lenticular_lens

    Diplopia (also known as double vision) is typically caused by a sixth cranial nerve palsy that prevents full control of the muscles that control the direction the eye is pointed in. These films are defined in the number of degrees of correction that is needed where the higher the degree, the higher the directive correction that is needed.

  9. Vertex distance - Wikipedia

    en.wikipedia.org/wiki/Vertex_distance

    Vertex distance. Vertex distance. Vertex distance is the distance between the back surface of a corrective lens, i.e. glasses (spectacles) or contact lenses, and the front of the cornea. Increasing or decreasing the vertex distance changes the optical properties of the system, by moving the focal point forward or backward, effectively changing ...

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