Prescription Numbers Explained
Right = OD
Left = OS
For a single vision correction, there will be up to 3 numbers for each eye: Sphere, Cylinder and Axis (you may only have a Sphere number for each eye). The Cylinder and Axis numbers go together - that is, if you have a Cylinder number, you must also have an Axis number.
The numbers are usually listed in .25 increments and the sign (+ or -) for the Sphere and Cylinder is important. Sometimes the decimal is omitted (125 = 1.25 and 025 = 0.25).
For more information see http://en.wikipedia.org/wiki/Eyeglass_prescription
Note: If you are ordering and want to continue your order and supply the PD later, simply enter "to come" for now. Call-in or email the information later.