Enter your prescription details int the following format: OD(right) -1.00 -2.00 x30 OS (left) -1.00 -2.00 x35 PD= 65 (or 32.5/32.5) Or if you are unsure how to enter your prescription you can also email it to admin@sporteyes.biz or fax to 888-240-6551. In the box enter "emailed" or "faxed" and then attach your order number to your email/fax. PD= Pupil Distance. This ensures that the center of the lens lines up with the center of the pupil where you get the best vision. If you don't enter one, we will use a standard but we encourage you to obtain this from wherever you got your last pair of glasses made. This will give you the best possible vision.