Do you have Vision Problems when Diving? Rx Lenses are offered on Several Tusa Styles of Masks. This Option allows the Diver to choose Right and Left Lens Powers in both a variety of Diopter for Maximum Flexibility and for a Custom Fit. Just as Eyeglasses are the Easiest and Safest Way to Correct Vision Topside, Corrective Lenses are the Simplest and most Cost Effective choices for Correcting Vision Underwater. Tired of not being able to see well underwater? Can’t read your computer or gauges? Maybe you not sure what F-Stop you are setting your camera on? If these are problems for you when diving, you need to get a set of Diopter lenses for your dive mask. If you need corrective lenses for your Liberator-Plus Series 2 Windowed Mask, it can be easily fitted with Optical Lenses from -1.5 to -8.0 Diopters in 0.5 increments. Lenses are manufactured from Tempered Glass. Stop squinting and dive safer with corrected vision underwater