Cross cylinder to Spherocylinder - OptomInSight

Step 1: Choose either one cross cylinder out of two, as the sphere.Step 2: Subtract the cross-cylinder which was taken as the sphere from the other cylinder which was not taken as the sphere in step 1.Step 3: Axis of the sphero cylinder form is the same as the axis of the cross-cylinder which was not taken as the sphere.

Simple Transposition (Toric Transposition) - A complete Tutorial.

BLOC 5: ASTIGMATIC LENSES Subject 11.- Sphero-cylindrical Formula. Subject 12.- Sphero-cylindrical formula and the lens- meter. Subject 13.- Transposition. - ppt download

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