Glass contact lenses; effects of ventilation.

Ventilated Glass Contact Lenses.

Reliability of power profiles measured on NIMO TR1504 (Lambda-X) and effects of lens decentration for single vision, bifocal and multifocal contact lenses.

PURPOSE To evaluate the repeatability of power profiles measured on NIMO TR1504 (Lambda-X, Belgium) and investigate the effects of lens decentration on the power profiles for single vision (SV), bifocal (BF) and multifocal (MF) contact lenses. METHODS Accuracy of the sphere power was evaluated using single vision BK-7 calibration glass lenses of six minus and six plus powers. Three SV and fou...

The study of Lysozyme adsorption onto 2-hydroxyethylmethacrylates and Silicon Hydrogel Contact Lenses

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 adso...

Contact lenses wettability in vitro: effect of surface-active ingredients.

PURPOSE To investigate the release of surface-active agents (surfactants) from unworn soft contact lenses (SCLs) and their influence on the lens surface wettability in vitro. METHODS Surface tension (ST) of blister pack solutions was measured by pendant-drop technique. STs at the air-aqueous interface and contact angles (CAs) of four conventional and seven silicone hydrogel SCLs were evaluate...

میزان استفاده و آگاهی دانش‌آموزان دبیرستان‌های دخترانه‌ی شهر زنجان از لنزهای طبی‌ _ رنگی در سال تحصیلی 1382

Background & objective: The aim of this study was to investigate the knowledge and use of contact lenses by high school female students in Zanjan in 2003. Materials & Methods: The designed questionnaire was randomly distributed among the high school female students. Then the questionnaire’s questions were standardized based on the study. The main sample size was 700. The samples were selected o...