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The first contact lenses were made of glass, in 1888. Initially the glass was blown but soon lenses were made by being ground to shape. For the first fifty years, glass was the only material used. The lenses were thin, yet reports of injury were rare. In 1938 perspex (polymethylmethacrylate, or PMMA) began to replace glass in contact lens ...
Orthokeratology lens. Orthokeratology, also referred to as Night lenses, Ortho-K, OK, Overnight Vision Correction, Corneal Refractive Therapy (CRT), Accelerated Orthokeretology, Cornea Corrective Contacts, Eccentricity Zero Molding, and Gentle Vision Shaping System (GVSS), is the use of gas-permeable contact lenses that temporarily reshape the cornea to reduce refractive errors such as myopia ...
A piece of CR-39 manufactured for radiation detection. Poly (allyl diglycol carbonate) (PADC) is a plastic commonly used in the manufacture of eyeglass lenses alongside the material PMMA (polymethyl methacrylate). The monomer is allyl diglycol carbonate (ADC). The term CR-39 technically refers to the ADC monomer, but is more commonly used to ...
Essilor International is a French multinational corporation specialized in the design, manufacture and sale of corrective lenses and ophthalmic optical equipment. [1] Founded in 1972 out of the merger of two French companies operating in the sector, Essel and Silor, [2] it is headquartered in Charenton-le-Pont, near Paris.
Online only NatWest Group†† [b] 1968 Edinburgh, Scotland 691.0 61,500 523 Santander UK: 2010 London, England 275.4: 19,500 444 Starling Bank: 2014 London, England 14.7 [15] 3,500 Online only Tandem Bank: 2015 London, England 0.5 [16] Online only The Co-operative Bank: 1872 Manchester, England 25.5 [17] 3,350 77 TSB Bank: 1810 (reestablished ...
[50] [51] She next played a spoiled adolescent in the Walt Disney television film Beverly Hills Family Robinson, which aired on ABC in January 1997. After reading the script for Joss Whedon 's television series Buffy the Vampire Slayer , which follows Buffy Summers , a teenager burdened with the responsibility of fighting occult foes and ...
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