A lot of factors go into the mask you choose. Your mask will affect your field of vision, your ability to shield yourself from outside light, the ease with which you can clear your mask, and more.
Dual lens masks stay close to the eyes, giving you greater peripheral vision. And since the lenses take up less space, they’re easier to fit with prescription lenses and easier to clear.
Single lens masks give you a broad, uninterrupted view of the marine scenery, since there’s no bridge blocking the middle of your field of vision. A single lens mask can also make it easy to maintain binocular vision.
If you're just starting out, you may be interested in sets that combine masks with other basic gear like snorkels or fins. And if you want to put your own spin on it, some masks can be adjusted for fit, comfort, and color with accessories.
