Optometry & Vision Science

Skip Navigation LinksHome > July 2013 - Volume 90 - Issue 7 > Predictive Value of Corneal Topography for ClearKone Hybrid...
Optometry & Vision Science:
doi: 10.1097/OPX.0b013e318297da25

Predictive Value of Corneal Topography for ClearKone Hybrid Contact Lenses

Downie, Laura E.

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Purpose: The purpose of this study was to evaluate the predictive value of corneal topography data for fitting ClearKone hybrid contact lenses on eyes with corneal ectasia.

Methods: Ophthalmic records from eyes with established corneal ectasia that had been successfully fitted with SynergEyes ClearKone lenses (n = 73) were retrospectively reviewed. Correlations between corneal parameters (simulated steep and flat keratometry values, average corneal sagittal height, inferior-superior index for keratoconus, corneal eccentricity, cone displacement, and cone diameter) and ClearKone lens parameters (vault and skirt curvature) were analyzed.

Results: Two topographical correlates to ClearKone lens parameters were identified. Mean weighted corneal sagittal height at a 7.4-mm chord was strongly predictive of the optimal ClearKone lens vault; a linear relationship was observed between these parameters (R2 = 0.96). More significant vertical decentration of the corneal apex was found to be associated with the need for a steeper lens skirt curvature (p < 0.05).

Conclusions: This study demonstrates that baseline corneal topography–derived data are valuable for predicting lens parameters for an optimally fit SynergEyes ClearKone hybrid contact lens.

© 2013 American Academy of Optometry


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