You might want to go directly to a dive shop, rather than ordering on line, at least to make sure the type and brand you order fits. The new soft silicone masks need to fit your face or they do a really lousy job of keeping out the water. If you are adding the expense of prescription lenses, it would be sad to have a leaky mask. Fit around the eyes (it is easy to get too wide) and around your upper lip, with the snorkel or regulator in place, are critical. There are also different types, split or single, rated for depths during just a snorkel or for greater depths if diving.