This is the RX Prescription Lenses for the Promate SeaViewer Mask Series - Optical Lens(Far Sighted and Near Sighted) Full LensFeatures: Prescription mask available - See Items: MSK362 and MSK58 Please note there will be an additional 2 to 3 days processing time for most RX lenses Cost is per single lens only Low volume Broad peripheral view Optical lenses available from -1.0 to -10.0 by increments of 0.5 (for near sighted) Optical lenses available from +1.0 to +4.5 by increments of 0.5 (for far sighted) RX Prescription Lenses for the Promate SeaViewer Mask Series - Optical Lens(Far Sighted and Near Sighted) Returns are not accepted for used lens. Only unused lens are eligible for return with store credit.