Create your own glasses by choosing the correct lenses for you and snap them in the Ocean Reef Optical Lens Support. So easya | These lens can be installed by your optician or by yourself These durable plastic lens are made to be used only with OCEAN REEF Optical lens 2.0 NOTE: does not include Optical lens support frame. Requires frame to be used. get the frame here RX024 Cost is per single lens only Improves Underwater Vision Increased Diving Safety Range: -1.0 to -4.0 Diopters The frame (NOT INCLUDED) can be installed in all OCEAN REEF FFSM and scuba masks (with the exception of XS size). Returns are not accepted for used lens. Only unused lens are eligible for return with store credit.