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  2. Orthokeratology - Wikipedia

    en.wikipedia.org/wiki/Orthokeratology

    Orthokeratology lens. Orthokeratology, also referred to as Night lenses, Ortho-K, OK, Overnight Vision Correction, Corneal Refractive Therapy (CRT), Accelerated Orthokeretology, Cornea Corrective Contacts, Eccentricity Zero Molding, and Gentle Vision Shaping System (GVSS), is the use of gas-permeable contact lenses that temporarily reshape the cornea to reduce refractive errors such as myopia ...

  3. Contact lens - Wikipedia

    en.wikipedia.org/wiki/Contact_lens

    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] In 2010, the worldwide market for contact lenses was estimated at $6.1 billion, while the US soft lens market was estimated at $2.1 billion. [ 3 ]

  4. Presbyopia - Wikipedia

    en.wikipedia.org/wiki/Presbyopia

    Corrective lenses provide vision correction over a range as high as +4.0 diopters. 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.

  5. Driving at night can get harder starting as early as your ...

    www.aol.com/lifestyle/driving-night-harder...

    According to the market research platform Gitnux, 10% of drivers reported having problems with night vision, while 62% feel less confident driving at night compared to during the day. Those ...

  6. Pinhole occluder - Wikipedia

    en.wikipedia.org/wiki/Pinhole_occluder

    A pinhole occluder is an opaque disk with one or more small holes through it, used by ophthalmologists, orthoptists and optometrists to test visual acuity. The occluder is a simple way to focus light, as in a pinhole camera, temporarily removing the effects of refractive errors such as myopia. Because light passes only through the center of the ...

  7. Visual acuity - Wikipedia

    en.wikipedia.org/wiki/Visual_acuity

    A person's visual acuity is registered documenting the following: whether the test was for distant or near vision, the eye(s) evaluated and whether corrective lenses (i.e. glasses or contact lenses) were used: Distance from the chart D (distant) for the evaluation done at 20 feet (6 m). N (near) for the evaluation done at 15.7 inches (400 mm).

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