This is the RX Prescription Lenses for theMC-5000 for the Tusa Liberator Plus Mask - Optical Lens(Near Sighted) Features: Prescription mask available - Item code: MSK325 Please note there will be an additional 2 to 3 days processing time for most RX lenses Cost is per single lens only Available in Left and Right Negative Diopters: -1.5 to -8.0 Compatible Masks: TM-5700 Liberator Plus, TM-5800 Liberator Plus Hyperdry These corrective lenses can be inserted into the TM-5700 Liberator Plus and the TM-5800 Liberator Plus Hyperdry masks. Available in 0.5 diopter increments from -1.5 to -8.0 for left and right lenses. Returns are not accepted for used lens. Only unused lens are eligible for return with store credit.