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KMID : 1011420130180040441
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Journal of Korean Ophthalmic Optics Society
2013 Volume.18 No. 4 p.441 ~ p.447
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Axial Rotation of Toric Soft Lens by Corneal Astigmatism and Change of Posture
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Kim So-Ra
Kim Hyun-Sun
Jung Ga-Won
Park Hyung-Min
Park Sang-Hee
Park Mi-Jung
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Abstract
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Purpose:The present study was conducted to investigate the axial rotations of toric soft lens during the change
of lens wearer’s posture, and the relationship between its rotation and corneal astigmatism.
Methods:The amount, direction, and speed of toric soft contact lens rotation were measured for 42 eyes (aged 20s) with the rule astigmatism in the straight and lying postures, and it compared between their changes according to corneal astigmatism.
Results:There was no significant difference in the axial rotation of lens for the astigmatism
prescription between the straight and lying postures. However, the rotation angle was significantly different
according to the posture of lens wearer. Rotating directions in straight posture were nasal direction for 20 eyes
and temporal direction for 22 eyes. In lying posture, lenses of most wearers were rotated to a direction of lying
posture, and the initial rotating speed was very fast in initial wearing for ?0.75 D toric lenses, but consistency for
?1.25 D toric lenses. The rotation angle in lying posture showed significantly different according to the amount
of corneal astigmatism, the lens speed was also significantly different according to the wearing time but not the
amount of corneal astigmatism.
Conclusions:The axial rotation of toric soft lens was different by the lens
wearer’s posture and its amount was the greater with the higher degree of corneal astigmatism. Thus, these
factors should be considered for the development of toric lens design
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KEYWORD
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Toric soft contact lens , Total astigmatism , Corneal astigmatism , Rotation angle , Rotation speed
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