You don't need to be shortsighted! With a symmetrical design, this single lens can be used for either the left or right eye and can be assembled in just 15 seconds with the Mariner Pro Optical Kit - available for separate purchase. The Mariner Pro optical lens meets your individual needs, so you can focus on enjoying the water. With ultra-soft material, anti-fog coating, and overall UV400 protection, see underwater with comfort, clarity, and confidence.