title: Predictive value of corneal topography for ClearKone hybrid contact lenses.
abstract: OBJECTIVE
  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 (R = 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.
authors.affiliation: Department of Optometry and Vision Sciences, University of Melbourne, Victoria, Australia.
authors.forename: Laura E
authors.initials: LE
authors.lastname: Downie
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D003261:Contact Lenses; D003315:Cornea / Q000473:pathology*; D019781:Corneal Topography / Q000592:standards*; D004108:Dilatation, Pathologic / Q000628:therapy; D005260:Female; D006801:Humans; D007640:Keratoconus / Q000628:therapy*; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D017755:Prosthesis Fitting; D012189:Retrospective Studies; D055815:Young Adult