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KMID : 1011420140190030305
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Journal of Korean Ophthalmic Optics Society
2014 Volume.19 No. 3 p.305 ~ p.313
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A Correlation between Axis-Rotation and Corneal Eccentricity in Toric Soft Contact Lens Fitting in With-the-rule Astigmatism
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Park Hyung-Min
Park Kyoung-Hee
Kim So-Ra
Park Mi-Jung
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Abstract
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Purpose: A correlation between the rotating direction and rotation amount according to the eccentricity was analyzed in the present study when fitting the toric soft contact lens.
Methods: One hundred fourteen eyes of with-the-rule astigmatism in 20s and 30s were appropriately applied toric soft contact lens by the guideline of manufacturer and fitting evaluations and analyzed the rotating direction and rotation amount when fixating at primary position and 8 different directions of gaze. The speed of reorientation and the correlation between the rotation amount and cornea eccentricity were also analyzed when rotating 45o each toward the temporal and nasal
direction.
Results: The cornea eccentricity and rotation amount was shown positive correlation. For the gaze of direction, it was identified that the gaze of directions other than the gaze of direction towards the nasal and temporal had correlation, and among them, the gaze of directions to superior and the superior-temporal showed the tendency of decreasing rotation amount as the cornea eccentricity increased. On the contrary, the gaze of direction towards the inferior, inferior-temporal, superior-nasal, and inferior-nasal showed tendency of increasing rotation amount as the cornea eccentricity increased thus, it was identified that the cornea eccentricity showed different correlation according to the gaze of direction. For the case of re-orientational speed, the speed of lens reorientation in the group having the smallest corneal eccentricity was fastest in both direction but was not significantly different.
Conclusions: Considering cornea eccentricity to current method of prescribing toric soft contact lens which is based on total astigmatism, it will be helpful to establish the optimal axis stabilization.
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KEYWORD
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Toric soft lens, Total astigmatism, Corneal eccentricity, Axis-rotation, Speed of re-orientation
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