• PD or pupil distance is measured during your eye exam, but may not be indicated on the prescription that your eye doctor gives you. This distance is important to you and the lab making your lenses. We will need to know what your PD is and your eye clinic will give you this information if you call.

• Having a current prescription by date is necessary for the optic lab to manufacture your new lenses. Prescription lenses can not be made based from a expired prescription. Or should not be made from prescription based a digital lens reader. This is both a legal and ethical issue.

• Having the center of a prescription offset to accommodate where you look through the lens during the shot process is recommended for shooting. This offers the clearest optic center location, designed for where we looking over the shotgun. 4 to 6 millimeter left or right based on left or right shooting. If you plan to use your shooting glasses for street use or anything other, we recommend placing the optic center based on your PD and normal use activities.

• Making the decision on purchasing 8 or 6 base curvature. We recommend the 6 base curve for prescription. While manufacturing it should be noted that the stronger the prescription, the thicker the outside edge of the lens will get. To also include offsetting the optic center. We find with too thick of lens, the cleat that holds the lens in the frame may not properly secure on the 8 based frame.

• We manufacture lenses out of polycarbonate for safety reasons, and the Bob Allen company requires this specification. Realize that the Abby clearity rating is less for poly than glass. There are coatings and treatments that will improve the performance of poly. We offer these processes to you as a perscription option and upgrade. We can manufacture lenses in other materials for other frame manufactures only.