Dry Eye Syndromes Clinical Trial
Official title:
Tear Lipid Layer Thickness Changes With Use of Emollient and Non-Emollient Eye Drops
Cross-over comparison of lipid layer thickness and dry eye symptoms with two artificial tear formulations.
This study will objectively evaluate two US lubricant eye drop formulations produced by Alcon, INC. Systane® Ultra, a non-emollient eye drop, will be compared to Systane® Complete, an emollient eye drop, in subjects with dry eye symptoms and lipid layer thickness < 75 nm at baseline in a randomized, cross-over (masked subject) design. We seek to objectively evaluate the increase in lipid layer thickness from baseline at 15 minutes and 1, 2, 4 and 6 hours after each eye drop has been instilled. Non-invasive measurements of tear break-up time will be also conducted at each visit. Subjects will then be dispensed the emollient eye drop (Systane® Complete) for use four times daily for one month and return to the study site for final measurements of dry eye symptoms, lipid layer thickness, and tear break-up time. The Stroboscopic Video Color Microscope of King-Smith is used for non-invasive lipid layer thickness measurement, and the Oculus Keratograph (K5M) is used for non-invasive measurements of tear break-up time. ;
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