You had asked about prescription masks on another post. Ran across some more info, if you're interested. decided on a new post so you wouldn't miss it.
Blu Hole Dive Center (www.bluedive.com
, email@example.com) rent prescription masks. They have switchable diopter from 2 to -8 for each eye. They can also customize for your prescription.
I've used Blue hole before...they were great. Another good thing is that if you need to rent more than $15 worth of equipment per day, you only pay a max of $15.
Have fun! Sharon