I wore my contact lenses all day at Discovery Cove and it worked out great! The mask did not leak. There is a place where you can borrow prescription masks but I thought I would give my lenses a try first. We were in the water all day and went in and out of the river all over the park so carrying my glasses would have been a pain and I can't see on land without them. I brought the mask to the dolphin swim part because I thought there would be splashing and I would need the protection so I wouldn't lose my lenses but I didn't need it. What an awesome day it was and so much more convenient that I could keep my contacts in.