Dolphins and eye glasses?

Can you wear eye glasses when swimming with the Dolphins? The tour description says no metal. Tour operator and Cruise line are not responding to my calls or emails. Has anyone worn their eyeglasses during this excursion?

At Chankanaab (sp?) in Cozumel, I kept my prescription sunglasses on the whole time. The do warn you that it's possible to lose them. We always had our heads above water as we were wearing life vests and I was fine. Maybe attach them to a cord meant for glasses. You should be just fine.