I was advised to have your eye test done here in the UK and then take the prescription over with you. The designer frames can be up to around 60% cheaper than here, so I have been told. Not sure about contacts.

I intend to take advantage on my next trip. I have only really seen Wal-Mart, but I am sure there must be lots more?? I think there is a shop at Belz, but not sure of the name, anyone know?