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Rx is customarily part of the superscription of a prescription, for a patient to purchase a prescription drug from a pharmacist. It can only be made in certain prescriptions. This is an approximate range based on the spherical (SPH) value. If you have astigmatism (CYL) in your prescription, this range may be further limited. Please enter your prescription on the order page to check whether the glasses are suitable for you.  

PD is the distance between your two pupils in millimeters. It is very important for accurately fitting your lenses to achieve visual acuity. If there is no PD on your prescription, checking with your eye doctor is recommended.
Or if you don't have it, here's how you can measure it yourself.
Click to download a Printable PD Ruler

This refers to the lens design which includes three fields of vision, without lines, and is sometimes referred to as a "no-line multi-focal".

In a progressive lens, the shape of the corrected part of the lens is approximately that of a funnel or a mushroom. The top portion is for distance-vision, narrowing to the lower middle for mid-range, finally to the bottom portion for the near-vision or reading. The reading area is expected to be smaller than the distance area. People sometimes prefer a single-vision lens for extended reading or up-close work.

The lens height for a progressive lens must be 36mm or greater. We recommend a taller lens for more comfortable wear, but the minimum lens height is 36 mm. If this frame has a lens height smaller than 36mm, a different frame must be chosen for progressive lenses.