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  2. Corrective lens - Wikipedia

    en.wikipedia.org/wiki/Corrective_lens

    A corrective lens is a device that improves visual perception by correcting refractive errors. Learn about the different types of corrective lenses, such as glasses, contact lenses, intraocular lenses, and their prescriptions, uses, and advantages.

  3. Presbyopia - Wikipedia

    en.wikipedia.org/wiki/Presbyopia

    People with presbyopia require a convex lens for reading glasses; specialized preparations of convex lenses usually require the services of an optometrist. [15] Contact lenses can also be used to correct the focusing loss that comes along with presbyopia. Multifocal contact lenses can be used to correct vision for both the near and the far.

  4. Adjustable-focus eyeglasses - Wikipedia

    en.wikipedia.org/wiki/Adjustable-focus_eyeglasses

    Adjustable focus eyeglasses are eyeglasses with an adjustable focal length. They compensate for refractive errors (such as presbyopia) by providing variable focusing, allowing users to adjust them for desired distance or prescription, or both.

  5. Eyeglass prescription - Wikipedia

    en.wikipedia.org/wiki/Eyeglass_prescription

    Learn how to interpret and write an eyeglass prescription that includes sphere, cylinder and axis components. Sphere and cylinder specify the power of the lenses, and axis defines the orientation of the cylinder relative to horizontal and vertical.

  6. Refractive error - Wikipedia

    en.wikipedia.org/wiki/Refractive_error

    Presbyopia: When the flexibility of the lens declines, typically due to age. The individual would experience difficulty in near vision, often relieved by reading glasses, bifocal, or progressive lenses. [14] Astigmatism is when the refractive power of the eye is not uniform across the surface of the cornea because of asymmetry. In other words ...

  7. Farsightedness - Wikipedia

    en.wikipedia.org/wiki/Farsightedness

    Farsightedness, also known as long-sightedness, hypermetropia, or hyperopia, is a condition where distant objects are seen clearly but near objects appear blurred. Learn about the causes, symptoms, complications, diagnosis and treatments of farsightedness, such as eyeglasses, contact lenses, and surgery.

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