• HEMA
  • Because of this property, it was one of the first materials to be successfully used in the manufacture of flexible contact lenses HEMA is also used as the monomeric matrix in which 40 nm silica particles are suspended for 3D glass printing. (wikipedia.org)
  • gels
  • From that time he devoted himself to studying of the synthesis of cross-linking hydrophilous gels, with the aim of finding a material suitable for employment in permanent contact with living tissues. (wikipedia.org)
  • conventional
  • In the conventional hard contact lenses, the materials comprising polymethyl methacrylate as main component have been used because of their excellent optical properties, high physical strength and good machinability. (google.com)
  • While conventional blister packs provide a convenient means for shipping and storing contact lenses, they are not designed to consistently provide easy access to the contact lenses. (google.com)
  • IOL implantation carries several risks associated with eye surgeries, such as infection, loosening of the lens, lens rotation, inflammation and night time halos, but a systematic review of studies has determined that the procedure is safer than conventional laser eye treatment. (wikipedia.org)
  • cornea
  • Descartes proposed another idea in 1636-a glass tube filled with liquid placed in direct contact with the cornea. (wikipedia.org)
  • The U.S. Food and Drug Administration (FDA) states that: Soft contact lenses are made of soft, flexible plastics that allow oxygen to pass through to the cornea. (wikipedia.org)
  • As the two come into contact, cellular and structural changes in the cornea adversely affect its integrity and lead to the bulging and scarring characteristic of the disorder. (wikipedia.org)
  • corrective lenses
  • People with early keratoconus typically notice a minor blurring of their vision and come to their clinician seeking corrective lenses for reading or driving. (wikipedia.org)
  • disinfection
  • If contact lenses are not properly cleaned, lysozyme, mucoproteins and other soils can accumulate on and/or in the lens to a point where the lens wearer begins to feel discomfort, for example due to altered lens fit, the lens spectral characteristics are adversely affected, for example through discoloration due to the deposits, disinfection may be impeded, and the gas permeability may be decreased. (google.com)
  • To assure disinfection, the lens must be stored for a minimum of 4 hours before reinsertion. (medshopexpress.com)
  • Clear Care Rinse & Go Solution can be used for rinsing soft (hydrophilic) contact lenses after cleaning and disinfection. (wegmans.com)
  • After disinfection, lenses may be stored in Clear Care Rinse & Go Solution for up to 30 days in the lens case. (wegmans.com)
  • wearers
  • As of 2010[update], the average age of contact lens wearers globally was 31 years old, and two-thirds of wearers were female. (wikipedia.org)
  • Contact lens wearers can also wear sunglasses, goggles, or other eyewear of their choice without having to fit them with prescription lenses or worry about compatibility with glasses. (wikipedia.org)
  • These drops are also not advised for contact lens wearers because decreased blood flow to the surface of the eye will further lower the levels of oxygen available to the eye. (wikipedia.org)
  • functional
  • Also, Japanese Patent Publication No. 57-35443 and Japanese Patent Application Laid-Open (Kokai) No. 58-17412 disclose the methods for forming lens materials by using a polymerization component having a functional group that can be after-treated for imparting hydrophilicity to the contact lens surface by an after-treatment. (google.com)
  • Others wear contact lenses for functional or optical reasons. (wikipedia.org)
  • manufacture
  • This enabled the manufacture of lenses that, for the first time, conformed to the actual shape of the eye. (wikipedia.org)
  • August Müller in Kiel, Germany, corrected his own severe myopia with a more convenient blown-glass scleral contact lens of his own manufacture in 1888. (wikipedia.org)
  • In 1965 National Patent Development Corporation (NPDC) bought the American rights to produce the lenses and then sublicensed the rights to Bausch & Lomb which started to manufacture them in the USA. (wikipedia.org)
  • oxygen
  • Accordingly, it would be highly desirable to providea polymeric, material suitable for use in fabricating contact lenses having increased oxygen permeability, improved mechanical strength, and which is sufficiently rigid to permit precision machining and polishing. (google.ca)
  • disclose
  • For instance, Japanese Patent Publication No. 56-39450 and Japanese Patent Application Laid-Open (Kokai) No. 58-7418 and 59-19918 disclose the methods for improving hydrophilicity of lens materials by means of copolymerization with hydrophilic monomers. (google.com)
  • defect
  • Since mold parting line 20 is tangent to the lens edge, misregistration of the mold halves where edge 16 contacts wall 6 does not result in a dibilitating defect in the lens edge. (google.es)
  • usually consist
  • IOLs usually consist of a small plastic lens with plastic side struts, called haptics, to hold the lens in place within the capsular bag inside the eye. (wikipedia.org)
  • materials
  • During handling and wear, contact lenses are susceptible to the accumulation of a variety of materials which may adhere to the surface of the lens and/or lodge within and adhere chemically and/or spatially to the inner bulk matrix of the lens. (google.com)
  • Heat sterilization techniques also tend to accelerate lens buildup by precipitating absorbed proteinaceous materials. (google.com)
  • They are also subcategorized into 1st generation, 2nd generation, and 3rd generation lens materials. (wikipedia.org)
  • During 1970 to 1974 he worked in Palo Alto, California, improving contact lenses materials and technology. (wikipedia.org)
  • Wettability
  • Wettability of the lens surface is important in order to allow tears to fill the lens-corneal interspace. (google.com)
  • The contact lens with poor surface hydrophilicity, i.e., poor wettability with tear liquid has the problem that it could make improper correction of eyesight. (google.com)
  • seal
  • A contact lens package includes a holder having a receptacle for holding a contact lens and a cap having a seal for sealing a contact lens within the receptacle. (google.com)
  • As the cap moves toward the opposite end of the holder, the end of the holder where the receptacle is formed ruptures the seal such that the contact lens can be removed from the package. (google.com)
  • The cap has a seal positioned adjacent the end of the holder where the receptacle is formed for sealing the contact lens within the receptacle. (google.com)
  • surface
  • The surface of the lens should be smooth in order not to affect the normal precorneal tear film and the superficial epithelial layer. (google.com)
  • Disclosed are compositions and methods for inhibiting the uptake of proteins and reducing the formation of lysozyme deposits on the outer surface and inner bulk matrix of hydrophilic contact lenses. (google.com)
  • No. 4,209,289 discloses a mold having continuous mating surfaces with the parting line at the junction of the lens edge and anterior lens surface. (google.es)
  • Recess 12 forms a groove extending around the periphery of surface 11 to define the edge shape of a lens cast in cavity 13. (google.es)
  • The amount of interference must be such that the shape of neither recess 12 nor surface 11 is distorted when mating surface 4 is in contact with mating surface 14. (google.es)
  • Referring to FIG. 2, the male mold member has a continuous mating surface 4 extending inwardly from side 9 to a line tangent to the edge 20 of the lens in cavity 13. (google.es)
  • A first portion 21 of the lens edge 3 is formed by a concave junction surface extending from mating surface 4 to convex molding surface 11. (google.es)
  • The female mold member has a continuous mating surface 22 extending outwardly from lens edge 21 toward outwardly tapering wall 6. (google.es)
  • Play media A contact lens, or simply contact, is a thin lens placed directly on the surface of the eye. (wikipedia.org)