Eyegirl2007,
You can think of the pretest section of the OAT as a small contibution to the profession. Attempting these questions and answering them to the best of your ability could indeed lead to a better OAT, which may qualify better and more worthy candidates for optometry school, etc. This idea is a stretch, but it is the line that our Director of Student Affairs used to get us 1st year students to take a sample verbal OAT test a few weeks ago. Everything in our profession is based upon making small improvements upon our solid foundation, and I think that this is one of them. Granted you are not fully invested in the profession until you have been accepted, but it is likely you will be accepted given your ambition to do so. My advice: take the pretest, help your future profession.
TAL
UHCO 2006