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KMID : 1011420160210010035
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Journal of Korean Ophthalmic Optics Society
2016 Volume.21 No. 1 p.35 ~ p.45
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Correlations between Axial Rotation of Toric Soft Contact Lenses and Corneal Eccentricity according to the Wearing Time and Gaze Directions
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Seo Woo-Hyun
Kim So-Ra
Park Mi-Jung
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Abstract
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Purpose: The present study was aimed to investigate the effect of corneal eccentricity on the axial rotation when wearing toric soft contact lenses were worn for certain time and changing the gaze directions.
Methods: Toric soft contact lenses with double thin zone design applied on 85 of with-the-rule astigmatic eyes. Then, rotational direction and amount of contact lenses were measured after 15 minutes and 6 hours of lens wear. The difference was further compared and analyzed according to corneal eccentricity.
Results: The rotation of toric lens showed a tendency to rotate to temporal direction in all gaze directions except temporal-upper direction in all groups of corneal eccentricity. The amount of lens rotation in the frontal gaze direction exhibited a negative correlation since the amount was decreased with increasing corneal eccentricity after both 15 minutes and 6 hours of lens wearing. In many cases, the cornea with small eccentricity also showed the lens rotation larger than 10o. The difference in rotational amount after 15 minutes of toric lens wear was small according to the corneal eccentricity however, the change of rotational amount of contact lens according to corneal eccentricity was shown after 6 hours of lens wear.
Conclusions: The present study revealed that the amount of axial rotation was largely varied according to the wearer’s corneal eccentricity when wearing toric lens and the rotational amount after certain time of lens was also affected by corneal eccentricity. Thus, it is suggested that the selection of toric soft contact lenses based on corneal eccentricity is necessary.
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KEYWORD
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Double thin zone design, Corneal eccentricity, Toric soft contact lens, Rotational direction, Rotational amount
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