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A Comparison of the Movements of Circle Contact Lens and Soft Contact Lens with Identical Material on Cornea  

Kim, So Ra (Department of Optometry, Seoul National University of Science and Technology)
Park, Sang Hee (Department of Ophthalmic Optics, Kaya University)
Joo, Seon-Ok (Department of Optometry, Seoul National University of Science and Technology)
Lee, Hye Rim (Department of Optometry, Seoul National University of Science and Technology)
Park, Mijung (Department of Optometry, Seoul National University of Science and Technology)
Publication Information
Journal of Korean Ophthalmic Optics Society / v.17, no.1, 2012 , pp. 27-35 More about this Journal
Abstract
Purpose: The present study was conducted to compare any difference caused by pigmentation in the centrations and movement patterns on the cornea between circle and soft contact lens with identical material and parameters during lens wearing. Methods: Soft and circle contact lenses with identical material and parameters were applied to twenty eyes with normal tear volume for 3 hrs a day during a total of 5 days and then their lens centrations, the moving distances and rotations by repeat blinking were compared. Results: The lens centration beyond the fitting criteria was shown in initial wears of both soft contact lens and circle contact lens. However, the centration of soft contact lens was changed to the pupil center for being suitable to the fitting criteria with longer wearing time. On the other hand, the decentration of circle contact lens in the horizontal direction was still presented even with longer wearing time. The moving distances of soft contact lens and circle contact lens decreased with the expand of lens wearing but were not significantly different between total wearing period and daily wearing time. The rotation of circle contact lens by repeat blinking was significantly different from that of soft contact lens even when the wearing period was extended. Conclusions: We revealed that the lens centration and movement of circle contact lens on cornea were different from those of regular soft contact lens resulting in bigger difference with the expand of wearing period in the study.
Keywords
Circle contact lens; Soft contact lens; Wearing period; Lens centration; Moving distance; Lens rotation amount;
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