. Convert to Minus cylinderAdd the sphere to cylinderReverse sign of cylinderAdd 90 degrees to axisExample:-5.50 1.50x80 becomes-4.00-1.50x170. . Vertex all powers >4D to corneal planeVertex equation:Fcornea=Fspec/(1-dFspec)F=powerd=vertex distance in metersMust vertex both meridians - PowerPoint PPT Presentation
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