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KMID : 1011420130180040429
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Journal of Korean Ophthalmic Optics Society
2013 Volume.18 No. 4 p.429 ~ p.439
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Changes in Subjective/Objective Symptoms and the Light Transmissibility of Lens Associated with Overusage of Daily Disposable Circle Contact Lenses in Normal Eyes
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Park Mi-Jung
Kwon Hae-Lim
Choi Sae-Ah
Kim So-Ra
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Abstract
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Purpose:This study was assessed to investigate the change of subjective and/or objective symptoms and the light transmissibility of lens caused by over-usage of daily disposable circle contact lenses (circle lens).
Methods: Three daily disposable circle lenses made of etafilcon A, hilafilcon B, and nelfilcon A were applied on 20 normal eyes free from any eye diseases by when subjects complained any kind of discomfort. On the first and the last
days of lens wearing, subjective discomfort, blinking rate, non-invasive break-up time, lens centration on corneal
surface and visible light transmissibility of lens were recorded at every case and compared.
Results:The circle lens wearers complained discomfort when they wore the circle lens more than 15 hours, in excess of 8 hours being the recommended wearing time and the most circle lens wearers quit the lens wearing when they wore more than 30 hours. On the last day of lens wearing, the representative subjective discomforts were stiffness,
dryness and tiredness. When the subjects wore circle lens more than the recommended time, a tendency of
increased blinking rate and decreased NIBUT was observed when it compared with the values right after lens
wearing. On the last day of lens wearing, the lens centration was shown to be decentrated from the pupil center
compared with the centration right after the wearing. These changes in lens centration and blinking rate were
consistently shown in all cases of lens wearing however, the difference in the degree of subjective and/or
objective change was present depending on lens materials and subjects. The visible light transmissibility of circle
lens has largely been changed.
Conclusions:From these results, it was thought that the decreased NIBUT
induced dryness and stiffness and decreased visible light transmissibility caused more blinking when daily
disposable circle lens was exceedingly used, which provoked lens decentration and subjective discomfort.
However, the difference of subjective and/or objective change was largely varied in accordance with the lens
material types and individuality and thus it may occur some unexpected problems by the individual base.
Therefore, the education about the necessity to comply with the recommended wearing time and the problem will
be essential.
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KEYWORD
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Daily disposable circle contact lens , Recommended wearing time , Over-usage , Lens centration , NIBUT(noninvasive break-up time) , Visible light transmissibility of lens , Subjective discomfort
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