This is the RX Prescription Lenses for the the Atomic Sub Frame Mask Series - Optical Lens(Bi focal and Near Sighted) Features: Prescription mask available - Item code: MSK123 Please note there will be an additional 2 to 3 days processing time for most RX lenses Cost is per single lens only Optical lenses available from -1.5 to -8.0 by increments of 0.5 (for nearsighted/myopic) Bifocal lenses available for +1.5, +2.0, and +2.5 (gauge reader) Both the Atomic Frameless and SubFrame models offer a new standard feature never seen or "seen through" before in a diving mask. We call them UltraClear lenses. UltraClear is a new and exciting optical quality glass with exceptional clarity and high light transmission, with no color distortion. The exceptionally high light transmittance and lack of distortion in the UltraClear lens maximizes the light available for improved visual acuity, especially underwater in low light conditions. Returns are not accepted for used lens. Only unused lens are eligible for return with store credit.