#137EBP Scuba Spec Optical Lens Insert for Dive and Snorkeling Masks.

The #137EBP Scuba Spec is a spectacle insert (i.e., eyeglasses) designed for use in all single lens dive masks and full-face snorkeling masks. The #137EBP Scuba Spec can not be used in a dive mask with two separate eye pieces. The #137EBP Scuba Spec securely attaches to the inner surface of the dive mask's faceplate using a suction cup. The nylon spectacle frame can accommodate any optical lens configuration and power: single vision,  bifocal vision, or readers. If your eye prescription changes, simply replace the lenses. Optical lenses are not included with the #137EBP Scuba Spec. Lenses can be purchased from www.spectacle-inserts.com/optical-lenses or your local eye care professional.  The #137EBP Scuba Spec insert is transferable between masks.