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KMID : 1011420120170040381
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Journal of Korean Ophthalmic Optics Society
2012 Volume.17 No. 4 p.381 ~ p.388
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The Change in the Parameters of Silicone Hydrogel Lens and Objective/Subjective Symptoms induced by Repetitive Dryness of Lens
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Kim So-Ra
Kang Byeong-Ho
Jung In-Pil
Park Mi-Jung
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Abstract
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Purpose: In this study, the changes in the shape of silicone hydrogel lenses, dryness of lens and objective/ subjective symptoms that could be induced by repeating dryness of lens and objective/subjective symptoms were investigated. Methods: After drying and rehydrating of silicone hydrogel lenses with different lens material and thickness for 4 times, their overall diameters and base curves were compared. Subjective symptoms, non-invasive tear break-up time (NIBUTs) and blinking rate were evaluated after wearing dehydrated silicone hydrogel lens. Results: Overall diameter and base curve increased in all tested silicone hydrogel lenses by repeating dryness and rehydration. The degree of change in over all diameter and base curve were variable on the material. There were irregular change of lens parameters in thicker lens. When the subjects wore silicone hydrogel lenses after drying and rehydrating, their NIBUTs were decreased and blink rates were increased regardless of lens material or thickness. In addition, repetitive drying of silicone hydrogel lenses affected the lens fitting. Therefore, subjective symptoms such as itching, pain, irritation, foreign body sensation, dryness tended to be increased. Conclusions: The results obtained from the study may suggest to develop durable silicone hydrogel contact lenses against dry environment since the changes in parameters of silicone hydrogel lens and the subjective discomfort were observed after repetitive drying and rehydration.
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KEYWORD
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Drying, Silicone hydrogel Lens, Over all diameter, Base curve, Non-invasive tear break-up time, Blink rate, Subjective symptoms
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