I had been looking for a diving mask with prescription lenses for a number of years. The best my local dive shop could come with was stick on lenses for reading instruments. Having found Seavenger on the Internet I couldn't believe how easy and inexpensive it was to purchase just what I needed. But after my first dive I was thrilled with my purchase. For the first time in many years I had perfect, sharp vision in the water and not a drop of water in the mask.