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Comfilcon A
Soft contact lenses are one of several types of contact lenses for corrective vision eyewear as prescribed by optometrists and ophthalmologists. Background In the US market, soft contact lenses are approved by the US Food and Drug Administration. The American Optometric Association published a contact lens comparison chart called ''Advantages and Disadvantages of Various Types of Contact Lenses'' on the differences between them. These include: * soft contact lenses * rigid gas-permeable (RGP) * daily wear * extended wear * disposable * planned replacement contact lenses. The US Food and Drug Administration (FDA) defines soft contact lenses as: History 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Soft Contact Lens
Contact lenses, or simply contacts, are thin lens (optics), lenses placed directly on the surface of the Human eye, eyes. Contact lenses are ocular prosthetic devices used by over 150 million people worldwide, and they can be worn to corrective lens, correct vision or for cosmetics, cosmetic or therapeutic reasons. In 2010, the worldwide market for contact lenses was estimated at $6.1 billion, while the US soft lens market was estimated at $2.1 billion.Nichols, Jason J., et a"ANNUAL REPORT: Contact Lenses 2010" January 2011. Multiple analysts estimated that the global market for contact lenses would reach $11.7 billion by 2015. the average age of contact lens wearers globally was 31 years old, and two-thirds of wearers were female.Morgan, Philip B., et al"International Contact Lens Prescribing in 2010" ''Contact Lens Spectrum''. October 2011. People choose to wear contact lenses for many reasons. Aesthetics and cosmetics are main motivating factors for people who want to avo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phosphorylcholine
Phosphorylcholine (abbreviated ChoP) is the hydrophilic polar head group of some phospholipids, which is composed of a negatively charged phosphate bonded to a small, positively charged choline group. Phosphorylcholine is part of the platelet-activating factor; the phospholipid phosphatidylcholine and sphingomyelin, the only phospholipid of the membrane that is not built with a glycerol backbone. Treatment of cell membranes, like those of RBCs, by certain enzymes, like some phospholipase A2, renders the phosphorylcholine moiety exposed to the external aqueous phase, and thus accessible for recognition by the immune system. Antibodies against phosphorylcholine are naturally occurring autoantibodies that are created by CD5+/ B-1 B cells and are referred to as non-pathogenic autoantibodies. Thrombus-resistant stents In interventional cardiology, phosphorylcholine is used as a synthetic polymer-based coating, applied to drug-eluting stents, to prevent the occurrence of cor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vasurfilcon A
Soft contact lenses are one of several types of contact lenses for corrective vision eyewear as prescribed by optometrists and ophthalmologists. Background In the US market, soft contact lenses are approved by the US Food and Drug Administration The United States Food and Drug Administration (FDA or US FDA) is a List of United States federal agencies, federal agency of the United States Department of Health and Human Services, Department of Health and Human Services. The FDA is respo .... The American Optometric Association published a contact lens comparison chart called ''Advantages and Disadvantages of Various Types of Contact Lenses'' on the differences between them. These include: * soft contact lenses * rigid gas-permeable (RGP) * daily wear * extended wear * disposable * planned replacement contact lenses. The US Food and Drug Administration (FDA) defines soft contact lenses as: History The first contact lenses were made of glass, in 1888. Initially ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polymacon
Polymacon is a non-proprietary (i.e., generic) term for a hydrophilic polymer A polymer () is a chemical substance, substance or material that consists of very large molecules, or macromolecules, that are constituted by many repeat unit, repeating subunits derived from one or more species of monomers. Due to their br ... of 2- hydroxyethylmethacrylate (HEMA) cross-linked with ethylene glycol dimethacrylate (62%) and water (38%). It is used in the manufacture of soft contact lenses, and is considered a low-hydration hydrogel of nonionic polymer. References Organic polymers {{polymer-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crofilcon
Soft contact lenses are one of several types of contact lenses for corrective vision eyewear as prescribed by optometrists and ophthalmologists. Background In the US market, soft contact lenses are approved by the US Food and Drug Administration The United States Food and Drug Administration (FDA or US FDA) is a List of United States federal agencies, federal agency of the United States Department of Health and Human Services, Department of Health and Human Services. The FDA is respo .... The American Optometric Association published a contact lens comparison chart called ''Advantages and Disadvantages of Various Types of Contact Lenses'' on the differences between them. These include: * soft contact lenses * rigid gas-permeable (RGP) * daily wear * extended wear * disposable * planned replacement contact lenses. The US Food and Drug Administration (FDA) defines soft contact lenses as: History The first contact lenses were made of glass, in 1888. Initially ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
