![]() ![]() Total lipids were determined by the sulfo-phospho-vanillin reaction. Polymacon and etafilcon A contact lenses worn for 2 weeks by 16 experienced contact lens wearers were used for the analysis. This study was performed to determine the levels of sPLA2 from the deposition on two different frequent-replacement contact lens materials. The concentration of secretory phospholipase A2 (sPLA2), the enzyme that hydrolyzes phospholipids, in tears is known to exceed the levels found in serum by four orders of magnitude. Recent studies have shown that low tear phospholipid levels are associated with tear film instability in hydrophilic contact lens wearers. Mochizuki, Hiroshi Yamada, Masakazu Hatou, Shin Kawashima, Motoko Hata, Seiichiro This paper describes in detail the geometry of the first lathe-cut hydrophilic lens approved by the Federal Drug Administration, the fitting methods utilizing trial lenses, and the results of 100 patients successfully fitted.ĭeposition of lipid, protein, and secretory phospholipase A2 on hydrophilic contact lenses. Few practitioners, including those who fit other types of hydrophilic lenses and hard lenses, have had any experience with this lens, and considerable interest has been generated by fragmentary reports of good results. In a review of the literature, it became apparent that there were very few articles describing the advantages, as well as the fitting techniques, of lathe-cut hydrophilic contact lenses. Lathe-cut hydrophilic contact lenses: report of 100 clinical cases. ![]() The effects on the hydrophilic contact lens-copolymers by different substances used for cleaning and storage solutions have been investigated as well. ![]() Contamination of the lens materials by microorganisms is also a point of special interest. Swelling characteristics and permeability of the different elastomeres are to be investigated in order to guarantee sufficient compatibility of contact lenses. Composition as well as possibilities of polymerization by irradiation were tested so long until copolymers were found which finally allowed the production of soft hydrophilic contact lenses. Compounds of the vinyl-type often are added to improve the optical and mechanical qualities. Low esters of methacrylic acid which may be polymerized by different methods are used predominantly for producing soft hydrophilic contact lenses. International Nuclear Information System (INIS) Copolymers for soft hydrophilic contact lenses: development and investigations ![]()
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