I’m also new to diving, only 20 dives so far, and use readers (150). When I purchased my mask I didn’t know about incorporated readers (kinda makes sense now, but at the time I didn’t even know or think it would be a problem). I tried reading gauges in the shop with the mask and it worked fine, but the shop is well lit and clear (perfect conditions). As I started diving I had trouble here and there reading my tank gauge. I dove in Monterey Bay and with the kelp the conditions were so dark I couldn’t see my tank pressure no matter what. I had to show my dive guide and have them monitor it. After that I did some searching and learned that there are two options, the glue in and incorporated prescription lenses. Since I already had a mask, which I LOVE (beside not being able to read the gauges

) I chose Trident mask readers and that have worked fine so far. I figured I could try them out (cost between $25-$40) and if they didn’t work I would replace my mask. Beforehand I contacted my mask manufacturer (Mares) and found that my model does not allow a replacement lens. The installation isn’t difficult, but you have to be careful and follow each step. The dive shop sales person told me to be careful of bubbles and have very clean/dry hands. He also said if the glue didn’t work the first time I could get some clear cement at a hardware and try again. So far I have only used them about 5 days (10 dives). They’re still adhered to my mask. I have a dive next week so I’ll see how they work after not using them for about 6 months. Just looking at the lens they look a little cloudy, so I’ll try them today in the pool to see if they’re going to work. I think my next dive mask will include a reader built in since my eyes are only getting worse as I age.
Hope this helps.
Not sure if it’s OK, but the Dive shop was Dive Dans in Santa Clara, CA and they had many in stock and available (I paid $40).