hello... i`m a newbie in scuba diving. On the land, i use either contact lenses/very high index specs. Currently i use contact lenses to dive as i don't have any other solutions. My corrective lenses is 1.8 / 1.9. What is the maximum err... can we say POWER here for prescription mask lenses? As i ask most of the dive shops they say that they only have 0.8 max... any advice guys?