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KMID : 1011420140190020189
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Journal of Korean Ophthalmic Optics Society
2014 Volume.19 No. 2 p.189 ~ p.198
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A Correlation between Axis-Rotation and Corneal Astigmatism in Toric Soft Contact Lens Fitting
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Park Hyung-Min
Kim So-Ra
Park Mi-Jung
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Abstract
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Purpose: The present has analyzed the correlation between the direction of lens and the amount of rotation upon soft toric contact lens fitting after classifying the corneal astigmatism.
Methods: Soft toric contact lens was fitted on 114 with-the-rule astigmatic eyes with total astigmatism of at least ?0.75 D in their 20s and 30s according to the fitting guideline of the manufacturer and the correlation between the astigmatic degree and the rotational direction/amount of rotation was analyzed by when keeping the eyes on the front and by changing the direction of gaze. As for re-orientation movement. The speed of lens re-orientation and total amount of lens rotation was
compared and analyzed by corneal astigmatism after mis-location of lens of 45o to temporal and nasal direction, respectively.
Results: The positive correlations were shown between corneal astigmatism and the direction of lens rotation and between corneal astigmatism and the amount of lens rotation. Meanwhile, the amount of lens rotation was different by the direction of gaze however, there was no correlation with corneal astigmatism. The speed of lens re-orientation was fastest in the group of high astigmatic degree when the lens was mis-located to both temporal and nasal directions.
Conclusions: For optimal axis stabilization of toric soft lens, it is proposed that the adjustment of fitting guideline considering corneal astigmatism is necessary since the current fitting guideline is only based on total astigmatism.
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KEYWORD
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Toric soft lens, Total astigmatism, Corneal astigmatism, Axis-Rotation, Speed of Re-orientation
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