You do not need an appointment to see Dr. Parrish, and they will let you come in as long as they have room to take you. I like Dr. Parrish b/c he is very accommodating to your needs and questions. After determining my contact lens prescription, he gave me a free pair — which really surprised me b/c the optometrist at another Costco DIDNOT do this for me. I think this is the best way to go in terms of helping your patients b/c it’s not best for them to continue to wear contacts of the wrong prescription if their prescription has changed. A free pair should do until they can order more. Dr. Parrish also checked to see if the pair of contacts he gave me is comfortable by testing to see if I’d like it better if he slightly increased/decreased the prescription — just in case. No other place has done this for me. Also, the best part is that the prescription he gave me was good for both contacts and glasses — which is an awesome perk. I would definitely recommend Dr. Parrish!!!