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A phakic intraocular lens (PIOL) is an intraocular lens that is implanted surgically into the eye to correct refractive errors without removing the natural lens (also known as "phakos", hence the term). Intraocular lenses that are implanted into eyes after the eye's natural lens has been removed during cataract surgery are known as pseudophakic.
In the 2017 fiscal year, such lenses accounted for 74.9% of all sales. [1] Interchangeable lenses for digital and conventional SLR cameras, including compact high-ratio zoom lenses of which Tamron was the pioneer in 1992 when it released the 28–200 mm. [3] The most-current lens of this type is the AF 16–300 mm F/3.5-6.3 Di II VC PZD MACRO ...
A Fresnel lens (/ ˈ f r eɪ n ɛ l,-n əl / FRAY-nel, -nəl; / ˈ f r ɛ n ɛ l,-əl / FREN-el, -əl; or / f r eɪ ˈ n ɛ l / fray-NEL [1]) is a type of composite compact lens which reduces the amount of material required compared to a conventional lens by dividing the lens into a set of concentric annular sections.
In the study Acanthamoeba, bacterial, and fungal contamination of contact lens storage cases, “101 asymptomatic daily wear cosmetic contact lens wearers” from one contact lens practice were studied to determine the occurrence of fungal, bacterial, and protozoal contamination of contact lens cases.
Glasses, also known as eyeglasses and spectacles, are vision eyewear with clear or tinted lenses mounted in a frame that holds them in front of a person's eyes, typically utilizing a bridge over the nose and hinged arms, known as temples or temple pieces that rest over the ears.
The lens had a unique bayonet mount optics, "jumping" diaphragm and 13 aperture blades. The aperture control ring was placed on the back of the lens and switched in steps. The workmanship was of a very high standard. The second Helios-44 served as a standard lens for Zenit-3 SLR cameras in 1960-62.
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