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The purpose of this study is to assess corneal staining and to measure the relative corneal epithelial "barrier" function (the degree to which the cornea can prevent penetration of colored sodium fluorescein dye into the eye) after 8 hours of wear with a known soft contact lens and multipurpose lens care solution combination.
This investigation will evaluate corneal staining and epithelial barrier function after eight hours of contact lens wear, which is past the peak staining time and more typical of daily lens wear time. A silicone hydrogel lens and multipurpose solution combination shown to induce significant corneal staining ( e.g. equivalent Grade 3 out of Grade 4 scale) will be used to evaluate potential corneal compromise. The study will be a prospective, single-center, double-masked, contralateral, daily wear investigation in adapted soft contact lens wearers. After a three day washout period (without lens wear, lenses will then be worn on one day for eight hours. Corneal staining and barrier function will be determined for a regimen and a saline control situation for each subject. Staining will be graded using the Efron Grading Scale, and permeability data will be estimated as the fluorescein penetration rate, Pdc in nm/sec for the test and control condition.
Allocation: Randomized, Control: Placebo Control, Endpoint Classification: Efficacy Study, Intervention Model: Single Group Assignment, Masking: Double Blind (Subject, Investigator, Outcomes Assessor), Primary Purpose: Diagnostic
ReNu Multiplus multipurpose disinfecting solution, Control
Southern California Colege of Optometry
Southern California College of Optometry
Published on BioPortfolio: 2014-08-27T03:17:55-0400
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A chemical system that functions to control the levels of specific ions in solution. When the level of hydrogen ion in solution is controlled the system is called a pH buffer.
Hypertonic sodium chloride solution. A solution having an osmotic pressure greater than that of physiologic salt solution (0.9 g NaCl in 100 ml purified water).
The measurement of curvature and shape of the anterior surface of the cornea using techniques such as keratometry, keratoscopy, photokeratoscopy, profile photography, computer-assisted image processing and videokeratography. This measurement is often applied in the fitting of contact lenses and in diagnosing corneal diseases or corneal changes including keratoconus, which occur after keratotomy and keratoplasty.
Fibroblasts which occur in the CORNEAL STROMA.
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