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.
Sphero cylinder to cross cylinder, Power cross
Figure 7 from The Jackson Cross-Cylinder. Part 1: Properties
2-14 - Practice Problems - Toric Lenses
Flat Transposition : Cross Cylinder to Sphero Cylinder
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The Cross Cylinder
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Retinoscopy - OptomInSight
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Jackson Cross Cylinder - OptomInSight
Jackson's Cross Cylinder. (A) A typical Jackson's Cross Cylinder. Red