Just a while ago I found the Opticians forum in which the issuance of PD (Pupillary distance) is the subject matter. One member says "PD is not taken unless the patient is ordering glasses, meaning it's not a regular measurement performed as part of an eye exam." So it's clearly stated on his phrase that the patient should order eyeglasses to have his PD. It simply denotes that Opticians don't want give you PD data easily. Does it sounds a good thing for you? When it comes to buying eyeglasses one word that usually comes to people's mind is Zenni. Actually, Zenni: the #1 online eyeglasses store where you can get quality yet affordable eyeglasses but Opticians keep you away from ZenniOpt. Since Zenni is already known and tested so it's highly recommended.