Improve your view underwater with optical lenses for the SCUBAPRO D-Mask (dive mask sold separately). Interchangeable lens system makes it easy to install optional optical lenses. Optical lenses range from -1.5 to -5.0 or +1.5 to +4.0 in 0.5 diopter increments. Ultra Clear lens is made from tempered glass for safety and long-term durability. Available separately as left and right lenses. Driven to constantly innovate and improve the diving experience, SCUBAPRO builds equipment for the work, sport, and lifestyle of people whose passion is found below the surface.