Steps of the cross-cylinder to Spherocylinder 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 … Read more
Another way of writing lens prescriptions is cross-cylinder form. Usually, this form is never used to write spectacle lens prescriptions. However, it gives you an in-depth understanding of the power of each meridian without the need to add or subtract. Or it divides Sphero-cylinder prescription into two Plano cylinders with their axis 90 degrees apart … Read more
It’s a method of converting spectacle prescriptions from one cylinder form to another i.e. plus cylinder to minus cylinder or vice-versa Steps of simple transposition: Step 1: Axis change: If the axis of the cylinder is equal or less than 90 degrees, add 90 degrees If the axis of the cylinder is more than 90 … Read more