فهرست مقالات Contact Lenses

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  1 - The effect of polar copolymers in protein absorption on contact lenses on 2-Hydroxyethyl methacrylate(HEMA)
  Mohammad Yari S.S Sharehjini Omid Moradi
  For the purpose of increasing the permeability to oxygen and equilibrium water content in contact lenses, polar copolymers with nonionic monomers such as 2-hydroxyethle methacrylate(HEMA) Is used. By adding the polar monomers to (HEMA), the permeability to oxygen and eq چکیده کامل

  For the purpose of increasing the permeability to oxygen and equilibrium water content in contact lenses, polar copolymers with nonionic monomers such as 2-hydroxyethle methacrylate(HEMA) Is used. By adding the polar monomers to (HEMA), the permeability to oxygen and equilibrium with water content is increased and also the absorption of proteins on lens surface is changed. In this research, the acrylic acid (AA) was added to (HEMA) monomers in versatile percents and was applied as surface. Three types of proteins including: Albumin, Lactoferrin and Lysozyme and UV-VIS spectroscopy is applied at 280 nm for the monitoring of absorption on these surfaces. The amount of absorption of these proteins in different pH values(4.8,6.8, and 8.8) is evaluated and the effect of pH on the protein absorption is studied. By adding the polar monomer to the (HEMA) surface the absorption of protein was changed and the amount of absorption depends to pH. پرونده مقاله
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  2 - The study of Lysozyme adsorption onto 2-hydroxyethylmethacrylates and Silicon Hydrogel Contact Lenses
  Omid Moradi
  In order to increase the water content and the oxygen permeability of hydrogels used in themanufacture of contact lenses, the polar monomer Silicon Hydrogel Contact Lenses (SHCL), and 2-hydroxyethyl methacrylate (HEMA) were copolymerized with the hydrogels. Due to the p چکیده کامل

  In order to increase the water content and the oxygen permeability of hydrogels used in themanufacture of contact lenses, the polar monomer Silicon Hydrogel Contact Lenses (SHCL), and 2-hydroxyethyl methacrylate (HEMA) were copolymerized with the hydrogels. Due to the presence ofpolar monomers in the conventional contact lenses, the major component of the human tear,lysozyme is extensively adsorbed onto their surfaces. The adsorption of lysozyme onto the contactlens’ surface leads to limitations in its application. The present study concentration of lysozyme,adsorbed onto the surface of HEMA and SHCL hydrogels were measured by UV-Vis spectroscopy.The lysozyme employed was obtained from solutions with similar to concentration of artificial tear.The adsorption results were examined by the Langmuir adsorption isotherm and the constants of thisisotherm were also evaluated. پرونده مقاله