Because the frame was designed to fit most, not all, I strongly encourage you to try the frame for a fitting before you purchase the lens. The frame ships free with a prepaid return label and can be returned within 30 days of purchase for a full refund less $7.  Free exchanges on the frame is offered.  Returned items must have the original contents and  no signs of wear or use.  Unfortunately, because the lens is custom tailored, the lens cannot be returned. Your ultimate satisfaction, however, is the highest goal so if you are not satisfied with the lens for any reason please let me know.  The lens can be remade free of charge within 3 months of purchase.  See the Warranty policy.