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KMID : 1011420100150040339
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Journal of Korean Ophthalmic Optics Society
2010 Volume.15 No. 4 p.339 ~ p.346
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The Difference of Tear Break-Up Time by the Fitting Statesof Soft Contact Lens in Normal and Dry Eyes
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Jung Da-I
Lee Heum-Sook
Kim So-Ra
Park Mi-Jung
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Abstract
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Purpose: The study was performed to compare the difference of non-invasive tear break-up time (NIBUT) with alignment or steep fitting of soft contact lens in normal and dry eyes.
Methods: Total 40 eyes (aged 20~30 years) were classified to the normal (n=20) or dry eye group (n=20) by the diagnosis methods for dry eyes and worn soft contact lens (polymacon material) with alignment or steep fitting. NIBUTs of lens wearers were separately measured at the points of before wearing, immediately after wearing and after stabilization of tear film.
Results: With alignment fitting, averaged NIBUT in the dry eye group after stabilization of tear film was not significantly different from that of the normal eye group. However, averaged NIBUTs in the normal and dry eyes had significant difference when measured immediately after lens wearing. However, the number of eyes having NIBUT less than 4.0 second was 30% higher compared to the number of normal eyes with steep fitting when measured immediately after wearing. Some shorten NIBUT in dry eyes with steep fitting was also shown after stabilization of tear film.
Conclusions: These results suggest that wearing soft contact lens in dry eyes differently affect tear film compared to normal eyes. Thus, dry eyes need more advertent fitting for contact lens wearing because of unstable tear film.
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KEYWORD
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Soft lens, Polymacon material, Dry eye, Fitting states, Non-invasive tear break-up time
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