What's in the box: Single Lens
Just as eyeglasses are the easiest and safest way to correct vision topside, corrective lenses are the simplest and most cost effective choice for correcting it 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.
See things clear underwater with these Negative Diopters for your Mares X-Vision Mask. Diopters are available from -1.0 to -7.0 in -0.5 Diopter increments both left and right lens. Easy to install and will make seeing underwater better and increase your diving safety.