When I started diving in 1967 I did not have a prescription mask. It was much more of a big deal back then to get one. I finally got one and my first dive using it was to Catalina. It was amazing. I still remember that dive. Nowadays, it is much easier to deal with. Most of the manufacturers have masks where you can just order your prescription and the LDS just drops the lenses in. My problem is that one of my eyes needs a -10 diopter. The only one I was able to find that goes that extreme is the Aqualung mask. It ordered it, got the lenses and it has worked fine. If you take a less severe correction, then you would have more choices. Now I am scheduled for cataract surgery so hopefully I will not need glasses anymore for distance and can choose any mask that fits. We will see (no pun intended). Absolutely, you should get some version of prescription for your diving.