Estimation of the hybrid lens parameters through rigid gas permeable lens fittingOriginal Research Article

To estimate the fitting parameters of the hybrid contact lens in patients with corneal ectasia using the rigid gas permeable (RGP) lens.
Thirty-four eyes with corneal ectasia were evaluated in this study. The patients were examined once with the RGP lens and once with the hybrid contact lens. The relationship between the base curvature of the RGP and the vault of the hybrid lens and the correlation between their powers were analyzed.
We found a linear relationship between the base curvature of the RGP lens and the vault of the hybrid lens (P The results of this study could be used for better and faster selection of the first hybrid contact lens.