I just bought a Scubapro Zoom EVO mask with bifocal lenses. The lenses are removable and they have a large assortment of lenses you can purchase. I got my prescription from my optomologyst and matched it with available lenses for the mask. works great. I am an OWSI and use my mask to read my slates in the pool and on cert dives when teaching. I bought the elastic ski strap also, eliminates the stap cover.