A Study Of Residual Astigmatism And Flexure In Fluoroperm 151 lenses Fit 0.50. D Flatter Than "K" On With-The-Rule Toric Corneas. Read more about A Study Of Residual Astigmatism And Flexure In Fluoroperm 151 lenses Fit 0.50. D Flatter Than "K" On With-The-Rule Toric Corneas.