Snorkling mask with perscription glass

I´m going to be in Kuala Lumpur in about 10 days and will need to buy a mask with -7.5 perscription glass. Can someone recommend a shop that has them? Thanks!! Dres

There is this shop selling diving equipments at Mid-Valley Megamall (sorry, but dont know the name). It's located somewhere in between the Cineplexes & the 2-level Pet Shop in the middle of the mall. Try look for them there.