I've been wearing glasses forever (>35 years) , and never once has the Optometrist conditioned Rx on what frames I was getting. I usually get the RX and go fill it. If DD has some special condition, you could call the Medical Coordinator at Admissions and they may be able to help you by providing specifications for the frames.
My optometrist had me try on plastic frames to find a bridge size that fit because that is the most important part. You don't want to have your glasses sliding of your face, so I would recommend at least getting a bridge size that fits your face.