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Opera glasses, also known as theater binoculars or Galilean binoculars, are compact, low-power optical magnification devices, usually used at performance events, whose name is derived from traditional use of binoculars at opera performances. Magnification power below 5× is usually desired in these circumstances in order to minimize image shake ...
Cataract surgery is the most common application of lens removal surgery, and is usually associated with lens replacement. It is used to remove the natural lens of the eye when it has developed a cataract, a cloudy area in the lens that causes visual impairment. [4][10] Cataracts usually develop slowly and can affect one or both eyes. [4]
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. Current bifocals and progressive lenses are static, in that the user has ...
Glasses used to correct presbyopia may be simple reading glasses, bifocals, trifocals, or progressive lens. [4] People over 40 are at risk for developing presbyopia and all people become affected to some degree. [1] Around 25% of people (1.8 billion globally) are currently affected. [3]
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Pince-nez. Pince-nez (/ ˈpɑːnsneɪ / or / ˈpɪnsneɪ /, plural form same as singular; [1] French pronunciation: [pɛ̃sˈne]) is a style of glasses, popular in the late 19th and early 20th centuries, that are supported without earpieces, by pinching the bridge of the nose. The name comes from French pincer, "to pinch", and nez, "nose".
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