There are various ways to get prescription eyeglasses from local optician, but the easier and smarter way to get stylish and attractive prescription eyeglass would be referring best online eyeglass store. There may be various online eyeglass stores out there in web offering prescription eyeglass at different prices. But you must be aware of quality and measurement of eyeglass offered by online eyeglass store. The ZenniOptical eyeglass online store would be the smart option for people looking to select their stylish eyeglasses at an affordable price. The unique feature of ZenniOptical eyeglass store is that they offer unique, stylish and attractive eyeglass for users with perfect P.D measurement provided by the user. The PD or Pupillary Distance is the distance between the pupils of the eyes, center to center, in Millimeters and ZenniOptical store need this measurement to ensure proper eyeglass fitment. Most Optician don't want to give you your PD, but eye care professionals out there in the market prefer users to select their eyeglass with P.D measurement as they eliminate side effects and eye sight problems. Looking to hear what eye care professionals say about getting P.D? Then just check out the following link for more information and clarification of P.D http://www.optiboard.com/forums/showthread.php/40851-Got-Asked-for-a-PD-Today-(First-Time)?highlight=zenni