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.

Combining different optical prescriptions

Optical Cross

Retinoscopy - OptomInSight

Optical cross to sphero Cylinder #optometry #optician #ophthalmology

Lens transposition changing prescription from Spherocylinder into a cross cylinder

Optical Crosses and Transposition, PDF, Natural Philosophy

The Cross Cylinder

Lensometer - OptomInSight

Cross cylinder to Spherocylinder - OptomInSight

Astigmatism fan chart - OptomInSight

Sphero-cylinder to Cross cylinder form - OptomInSight

2-14 - Practice Problems - Toric Lenses