John, we've had great success with Prescription Dive Masks, and I really recommend getting lenses ground to your prescription. They offer a different grind for photographers, with the close-focus lens extending a little bit higher in the visual field. Given that you don't need distance correction, maybe those would be worth checking out. (I wouldn't be happy with fuzzy distance vision, but that's a lifestyle choice). As to mask size, I've happily used Cressi Big Eye masks with prescription lenses for a long time.