The refractive error and the amount of refractive error are important in the decision-making process with respect to your being a candidate. If you do not have your glasses prescription, it can easily be obtained by our "reading of the glasses prescription" when you arrive at the office. If you wear contact lenses, it is very helpful for you to bring a contact lens box that has the prescription number on it, or call your optometrist, ophthalmologist, or dispensing optician and get a copy of the prescription before coming in for the screening examination.