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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]
The human eye is a sensory organ in the visual system that reacts to visible light allowing eyesight. Other functions include maintaining the circadian rhythm, and keeping balance. Arizona Eye Model. "A" is accommodation in diopters. The eye can be considered as a living optical device. It is approximately spherical in shape, with its outer ...
Orthokeratology or simply Ortho-K is a temporary corneal reshaping process using rigid gas permeable (RGP) contact lenses. [113] Overnight wearing of specially designed contact lenses will temporarily reshape cornea, so patients may see clearly without any lenses in daytime. Orthokeratology can correct myopia up to -6D. [114]
History of the single-lens reflex camera. The history of the single-lens reflex camera (SLR) begins with the use of a reflex mirror in a camera obscura described in 1676, but it took a long time for the design to succeed for photographic cameras. The first patent was granted in 1861, and the first cameras were produced in 1884, but while ...
Lenses for 1600F / 1000F cameras. 1600F with Kodak Ektar 2.8/80 lens. 1000F with Zeiss Tessar 2.8/80 lens. Pål-Nils Nilsson with Cook & Perkins Dallmeyer Dallon Tele-Anastigmat 5.6/500 lens. The original normal lens for the 1600F and 1000F was the Kodak Ektar 80 mm f/2.8. It was succeeded by the Zeiss Tessar in 1953. [1]: 388.
The Nikon F-mount is a type of interchangeable lens mount developed by Nikon for its 35 mm Single-lens reflex cameras. The F-mount was first introduced on the Nikon F camera in 1959. See Nikon F-mount → Nikkor; Lenses with integrated motors: List of Nikon F-mount lenses with integrated autofocus motors
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