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KMID : 1011420190240020117
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Journal of Korean Ophthalmic Optics Society
2019 Volume.24 No. 2 p.117 ~ p.124
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The Effect of Corneal Astigmatism on the Change of Axial Rotation while Wearing Toric Soft Contact Lenses
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Cho Chang-Kwon
Seo Woo-Hyun
Kim So-Ra
Park Mi-Jung
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Abstract
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Purpose: In this study, the changing pattern of axial rotation was investigated when the gaze direction and wearing time changed after wearing toric soft contact lenses according to the wearers' corneal astigmatism.
Methods: Toric soft contact lenses with double thin zone design were placed on 85 eyes having with-the-rule astigmatism. The changes in the axial direction and degree of rotation according to the gaze direction were respectively measured after 15 min and 6 h of wearing the lens. We further analyzed the difference of the axial rotation according to corneal astigmatism.
Results: On fixing the eyes on 9 gaze directions while wearing the toric soft lenses, the lenses were mostly rotated to the temporal direction, and the rotation to the temporal direction was greater with the wearing time. A higher change in the degree of rotation was observed in the low corneal astigmatism group when analyzing the rotational change based on 5° rotation according to the wearers’ corneal astigmatism in the primary gaze direction. However, the change in the degree of rotation in the middle and high astigmatism group was rarely observed.
Conclusions: From these results, it was found that the rotational pattern of the toric soft lenses varied by the lens wearers’ corneal astigmatism. Furthermore, the degree and direction of rotation were different according to the wearing time in each gaze direction. Therefore, it is suggested that the precise fitting guideline for toric soft lenses should be applied for the low astigmatism group having a large degree of lens rotation.
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KEYWORD
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Toric soft contact lens, Corneal astigmatism, Double thin zone design, Rotational direction, Degree of rotation
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