I would recommend you not start with these as I believe that you are not likely to be pleased with the result. I took a pair diving in Florida and ended up pulling them out because they didn't provide clear enough magnification to be worth it. It did magnify, and confirmed that a solution like this could work for me...but not these. This brand has tiny ridges or grooves in them and although I'm certain there is a reason behind this....they interfere with your ability to get clear magnification. The grooves are in the way and more importantly, the Push On lenses are the FIRST thing to fog in my mask. I can rinse the fog off the glass easily but the fog stays in the grooves unless you use your finger and wipe the fog off the Push On lenses. That's a major deal breaker for me. I am now trying Dive Optx and will try the Trident product if Dive Optx doesn't work. Save your money and try these other two first.