PD (PUPILLARY DISTANCE) is the distance between your two pupils in millimeters. If there is no PD on your prescription, checking with your eye doctor is recommended. 

 A (+) means you have trouble seeing near, and a (-) means you have trouble seeing things faraway. 

 When light meets a lens, three things happen. Some light passes through a lens, which is called refraction, some are absorbed and converted into heat, and the rest is reflected off. Glare is produced when light bounces off the lens. Glare or reflections can be annoying and in some serious cases can reduce vision. To improve vision through the appearance of the lenses and glasses, an anti-reflective coating (also known as AR coating) is used. 

Polycarbonate lenses are impact resistant, scratch coated, thinner lenses.

 Progressive lenses provide a smooth transition from the distance through intermediate to near, with all the in-between corrections included as well. You can look up to see anything in the distance, look ahead to view your computer in the intermediate zone and drop your gaze downward to read, and do fine work comfortably in the close zone. 

HAVE YOUR OWN FRAME? JUST NEED LENSES? CLICK ON LENS OPTIONS SELECT WHAT YOU NEED AND POICK UP IN STORE TO HAVE CUT TO YOUR OWN FRAME. (SOME RESTRICTIONS APPLY )