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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.
Luxottica Carlos sunglasses, produced by Luxottica prior to its licensing deals with fashion houses. Leonardo Del Vecchio started the company in 1961, [16] in Agordo north of Belluno, Veneto; today the company is headquartered in Milan, Italy.
Bifocals are eyeglasses with two distinct optical powers. Bifocals are commonly prescribed to people with presbyopia who also require a correction for myopia , hyperopia , and/or astigmatism . History
Sunglasses worn by an ocean kayaker A Sherpa mountain guide on an expedition to K2 (8.611 m), wearing anatomically shaped mountaineering sunglasses. Like corrective glasses, sunglasses have to meet special requirements when worn for sports. They need shatterproof and impact-resistant lenses; a strap or other fixing is typically used to keep ...
The prismatic lenses of the belay glasses are arranged so as to bend light from above through total internal reflection into the observer's eye, allowing the belayer to observe the climber while maintaining a comfortable head/neck position. The design based on the eyeglasses frame provides for a split field of vision:
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