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Current bifocals and progressive lenses are static, in that the user has to change their eye position to look through the portion of the lens with the focal power corresponding to the distance of the object. This usually means looking through the top of the lens for distant objects and down through the bottom of the lens for near objects.
The first world record in the men's 400 metres hurdles was recognised by the International Association of Athletics Federations in 1912. That inaugural record was the performance by Charles Bacon at the 1908 Olympics. [1] Three athletes, all from the United States, have had long-standing records.
Reading glasses are single vision lenses designed for near work and include over the counter glasses. They come in two main styles: full frames, in which the entire lens is made in the reading prescription, and half-eyes, style glasses that sit lower down on the nose . [ 2 ]
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Hicham El Guerrouj is the current men's record holder with his time of 3:43.13, [1] while Faith Kipyegon has the women's record of 4:07.64. [2] Since 1976, the mile has been the only non-metric distance recognized by the IAAF for record purposes. However, in international competitions such as the Olympics the term "mile" almost always refers to ...
1929 Sunglasses. A pair of sunglasses for women. Sunglasses or sun glasses are a visual aid which feature lenses that are coloured or darkened to prevent strong light from reaching the eyes. For centuries, Chinese judges had routinely worn smoke-colored quartz lenses to conceal their eye expressions in court.
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