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KMID : 1011420150200020133
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Journal of Korean Ophthalmic Optics Society
2015 Volume.20 No. 2 p.133 ~ p.140
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Difference in Rotation Pattern of Toric Soft Contact Lenses with Different Axis Stabilization Design
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박소현:Park So-Hyun
김동연:Kim Dong-Yeon/최주희:Choi Joo-Hee/변현영:Byun Hyun-Young/김소라:Kim So-Ra/박미정:Park Mi-Jung
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Abstract
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Purpose: It was investigated whether two different stabilization designs of toric contact lenses changed the rotational axis and degree of toric lenses according to body posture and gaze direction in the present study.
Methods: Toric soft contact lenses with Lo-TorqueTM design and ASD design (accelerated stabilized design) were
fitted on 52 eyes aged in 20s-30s. Then, rotational degree was measured at the five gaze directions including front gaze and the lying position.
Results: When gazing the front and vertical directions in the upright posture, lens was much rotated to nasal side for the Lo-TorqueTM design and temporal side for the ASD design. When gazing horizontal direction, both design lenses were rotated against to the gaze direction. Rotation degree was the smallest at superior direction gaze and the largest at nasal gaze. In case of the rotation degree less than 5o, Lo- TorqueTM design was more frequent when gazing front and vertical directions, and ASD design was more frequent when gazing horizontal direction. In addition, the lens with Lo-TorqueTM design was lesser rotation degree than with ASD design immediately after lying. On the other hand, the lens with ASD design was lesser rotation degree than with Lo-TorqueTM design 1 minute later after lying.
Conclusions: This study confirmed that axis rotation of the lens induced by gaze direction and posture was different according to axis stabilization design during wearing toric soft contact lens.
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KEYWORD
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Toric soft contact lens, Axis stabilization design, Direction of rotation, Rotation degree, Gaze direction, Lying posture
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