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FDA classification of soft contact lens materials [13] FDA lens group Adopted name Transmissibility level (Dk x10-11) Water content Chemical composition I non-ionic low water content: galyfilcon A 60 47% – lotrafilcon A 140 24% DMA, siloxane, TRIS: lotrafilcon B 110 33% polymacon: 7.5 36% HEMA: tetrafilcon 9.0 43.5% HEMA, MMA, NVP: II non ...
The word "surfactant" is a blend of surface-active agent, [ 1] coined c. 1950. [ 2] As they consist of a water-repellent and a water-attracting part, they enable water and oil to mix; they can form foam and facilitate the detachment of dirt. Surfactants are among the most widespread and commercially important chemicals.
Oxygen permeability ( OP) is a parameter of a contact lens that expresses the ability of the lens to let oxygen reach the eye by diffusion. In soft contact lenses, it is dependent on the thickness of the lens and the material of the lens, especially concerning the water content. Because of this dependence on thickness, transmissibility level ...
Polyvinylpyrrolidone ( PVP ), also commonly called polyvidone or povidone, is a water-soluble polymer compound made from the monomer N -vinylpyrrolidone. [ 1] PVP is available in a range of molecular weights and related viscosities, and can be selected according to the desired application properties.
Non-ionizing radiation. Non-ionizing (or non-ionising) radiation refers to any type of electromagnetic radiation that does not carry enough energy per quantum ( photon energy) to ionize atoms or molecules—that is, to completely remove an electron from an atom or molecule. [ 1] Instead of producing charged ions when passing through matter, non ...
Poloxamer 407 is a hydrophilic non-ionic surfactant of the more general class of copolymers known as poloxamers. Poloxamer 407 is a triblock copolymer consisting of a central hydrophobic block of polypropylene glycol flanked by two hydrophilic blocks of polyethylene glycol (PEG). The approximate lengths of the two PEG blocks is 101 repeat units ...
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