1. Prescription Information:

   • OD = right eye
   • OS = left eye
   • Brand name (eg. Acuvue)
   • BC / Base Curve (a number between 8.0 and 10.0)
   • DIA / Diameter (a number between 13.0 and 15.0)
   • Power / Sphere / Rx (a number between -20 and +20)

2. In Addition for astigmatic patients:

   • Cylinder (a number between -4.00 and +4.00)
   • Axis (a number between 0 and 180)
     Cylinder and Axis are usually separated by a ×

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