The only way that would happen was if you could find a very large mask that fitted over your glassess,most excursions have standard inexpensive masks. You need to go to a dive shop to get a mask that fits your glassess or get prescription lens put into your mask.
Some, not all, snorkel tour operators carry some masks fitted with corrective lenses. Waiting till you are on the boat and finding out that they do not can be a disappointment.
Alternatives include wearing contacts with the mask. Many people , my wife included, do this with no problems. We have snorkelled dozens of times and she has no problem with her contacts.
Another option is to purchase a mask with corrective lenses and bring it with you. This is what I do. Any dive shop will sell you a mask and have standard diopter lenses , usually in .5 increments , put in it . No prescription necessary. Get the strength just below your actual eyeglass correction. A good mask will cost about $40 and lenses will be abot $35 each. If you like to snorkel or dive it is well worth the nominal investment.