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Contacts should make correction easier because the corrective lens is fixed WRT the eye, so an aspheric contact could, I think, provide correction of higher-order optical aberrations than could eyeglasses, e.g., correcting spherical aberration (which isn't what the spherical component does, BTW; that corrects astigmatism).
After the war, the Armorlite Lens Company in California is credited with manufacturing the first CR-39 eyeglass lenses in 1947. CR-39 plastic has an index of refraction of 1.498 and an Abbe number of 58. CR-39 is now a trade-marked product of PPG Industries. [2]
After many years as rivals, Essel and Silor merged on 1 January 1972 to form Essilor, then the world's third-largest ophthalmic optical firm. [1] Its first year of existence was marked by the creation of Valoptec, a non-trading company composed of stockholder managers who held half the company's capital stock, and the purchase of Benoist-Bethiot, a French lens manufacturer specializing in ...
Lens clock. A lens clock is a mechanical dial indicator that is used to measure the dioptric power of a lens.It is a specialized version of a spherometer.A lens clock measures the curvature of a surface, but gives the result as an optical power in diopters, assuming the lens is made of a material with a particular refractive index.
The captain held an airline pilot's license and logged 13,606 hours. He was qualified on the Manila-Iloilo-Manila route as captain in May 1954, and his medical record required that he had to wear corrective lenses while exercising his pilot's license. The first officer held a commercial pilot's license with the DC-3 and logged 2,495 hours.
Contact lens associated/induced papillary conjunctivitis CLARE Contact lens associated red eye CLPU Contact lens associated peripheral ulcer CNS Central nervous system CNV Choroidal neovascularization: CRAO Central retinal artery occlusion CRVO Central retinal vein occlusion CSR Central serous retinopathy CVA Cerebrovascular accident Dx Diagnosis