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.

Figure 7 from The Jackson Cross-Cylinder. Part 1: Properties

Flat Transposition : Cross Cylinder to Sphero Cylinder

Cross cylinder to Spherocylinder - OptomInSight

2-14 - Practice Problems - Toric Lenses

Spherocylindrical Lenses

Hirschberg test - OptomInSight

Jackson Cross Cylinder - OptomInSight

Flat Transposition : Cross Cylinder to Sphero Cylinder

Sphero-cylinder to Cross cylinder form - OptomInSight

Flat Transposition : Cross Cylinder to Sphero Cylinder