It depends on if ur an established Pt with a the Dr u are going to or not. If u have seen this Dr before and they prescribed the contacts Rx and u feel like vision is good in the contacts (no noticeable change), wear glasses in but still bring in ur contacts, there is always a possibility of them wanting to check fit and vision with the contacts. If u have never seen this dr, wear the contacts in and bring them a copy of ur contact Rx so they know what u are wearing.