Scalloped channels enhance tear mixing under hydrogel contact lenses
| Autor: | Michael L. Giese, Gemma N. Soliman, Meng C. Lin, Valerie A. Lim, Laura E. Wofford, Kenneth A. Polse, Christopher Marmo, Clayton J. Radke |
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| Rok vydání: | 2006 |
| Předmět: |
Adult
medicine.medical_specialty Hydrophilic Materials science Adolescent Contact Lenses Surface Properties channels Ophthalmology & Optometry Medical and Health Sciences law.invention Optics law Clinical Research Ophthalmology soft lenses medicine tear mixing Humans Fluorometry Posterior lens Eye Disease and Disorders of Vision Fluorescent Dyes Asian lens designs business.industry Significant difference Equipment Design Contact Lenses Hydrophilic eye diseases Lens (optics) Contact lens Asian Americans Tears ethnicity Fluorescein sense organs business Optometry |
| Zdroj: | Optometry and vision science : official publication of the American Academy of Optometry, vol 83, iss 12 |
| Popis: | Author(s): Lin, Meng C; Soliman, Gemma N; Lim, Valerie A; Giese, Michael L; Wofford, Laura E; Marmo, Christopher; Radke, Clayton; Polse, Kenneth A | Abstract: PurposeTear exchange under a soft contact lens is directly related to the amount of lateral and transverse lens motion. Hydrodynamic modeling suggests that channels placed on the back surface of a soft lens will reduce fluid resistance and increase transverse lens movement. This study measured the effect of posterior lens surface scalloped channels on tear exchange.MethodsTear exchange in the postlens tear film (PoLTF) was estimated using a fluorometer to measure the exponential depletion of high-MW fluorescein under the lens expressed as the time to deplete 95% of dye (T95). A total of 32 subjects wore two pairs of identical lenses except that the experimental lens had 12 scalloped channels placed radially in the midperiphery of the posterior lens surface, whereas lenses without channels served as controls.ResultsThe mean +/- standard error T95 values for the channel lenses was 28 +/- 2 minutes compared with 32 +/- 2 minutes for the control lenses (p = 0.107). There was a marginally significant difference in T95 between two lens groups in Asian eyes (p = 0.054).ConclusionPlacing scallop-shaped channels on high-H2O content soft lenses improved the postlens tear pumping in Asian eyes. |
| Databáze: | OpenAIRE |
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