Prescription mask can be more difficult than they seam. First off not every mask fits everyone's face. Step 1, find a mask that fits you. We have found that the old suck in test really isn't that accurate. I can suck in on every mask but that doesn't mean that it will not leak. If you tilt your head back and the mask naturally lays flat around your face, you are good. If you have big gaps on the forehead or check bone, in all likeliness that mask will leak. once you pick a mask out and you are comfortable with the field of vision, then it is time to put your prescription in. Id all you need is distance then there are some masks with "Pop in Pop out" lenses. If you find that kind, that is the most inexpensive way to go. If you have any stigmatism or bifocal, than will be more expensive (250-290). We personally use a guy in New York and he will put your exact prescription in your mask. He does amazing work. So before I can guide you, what is your exact prescription? When you get this, make sure you get the PD#, they always leave it off.