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KMID : 1011420220270040321
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Journal of Korean Ophthalmic Optics Society
2022 Volume.27 No. 4 p.321 ~ p.326
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Effect of Corneal Shape on Tear Film Destruction Time and Location
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Jang Ye-Jin
Kang Hyun-Goo
Kim Su-Kang
Park Sang-Il
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Abstract
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Purpose: This study aimed to investigate the effect of corneal shape on the tear film break-up time and location using corneal topography and NIBUT test.
Methods: In fifty-four eyes without ocular disease, the corneal shape was classified into the round and bow tie types, and the initial tear film break-up time and location were measured. The tear film break-up time and location according to the difference in the radius of curvature between the central and peripheral and the shape of the cornea was confirmed. Furthermore, the correlation between the direction of the weakest meridian and the tear film break-up location was compared.
Results: When the difference between the radius of curvature at the central and peripheral cornea was less than 0.05 mm, the initial tear film break-up time was 1.92 seconds shorter, and the tear film break-up location was near the center of the average 2.24 mm. The radius of curvature of the central cornea, the radius of curvature of the tear film break-up site, and the cornea shape did not affect the tear film break-up time and location. The tear film break-up location was similar to that of the weakest meridian of the cornea by 44.44%, and it was confirmed that the tear film break-up location in the horizontal meridian was 55.56%.
Conclusions: In this study, we confirmed that the difference between the radius of curvature at the central and peripheral cornea had an effect on the tear film break-up time and location. Additionally, the tear film break-up location was found to be in the direction of the weakest meridian and the horizontal direction.
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KEYWORD
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Dry eye, Tear film break up time, Tear film break up location, Corneal shape
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