Hi Suey:
Although academics are strongly stressed, I found that all of the schools I have interviewed at were more concerned about my achievements out of the school setting.
I definitely do not have the highest grades (my GPA was 3.2 when I applied, and my average score on the OAT was 320), but I felt confident going into my interviews because I had a lot of experience working in the optometry field. Although my grades are not so great, I have interviewed and been accepted into ICO, SUNY, SCCO, and Newenco.
Don't get me wrong, grades are very important, but don't let that stress you out. If you can keep your GPA over a 3.0, you have a really good chance in getting into optometry school. If you have a lower GPA, you can always improve your chances by doing well on the OAT.
I would recommend doing everything BatLauren suggests. But most importantly, you need to volunteer with an optometrist and you need to show some kind of community service involvement. I was fortunate to have volunteered for a great optometrist for a couple of years before I applied, and I had done community service work at a school for blind children. Also, I think what set me apart from other applicants is that I actually worked for an ophthalmologist for a year before applying to optometry school. I found that my experience working with MDs helped me convince my interviewer that I knew optometry was the field for me, and I had actually made the effort to research other fields before committing myself to optometry (just as J.opt recommended).
Also, be prepared for the interview. I'm sure you can find a lot of old posts which you can read about the different interview experiences everyone has had at different schools, and then mentally prepare yourself to answer them. For example, my interview at ICO only revolved around 3 questions: tell me about yourself, tell me about your volunteer experience, and tell me if you participated in any pre-optometry clubs. Almost all my other interviews revolved around those questions, as well.
Your grades will get you the interview, but your personality and your desire to become an optometrist will get you into the school.
Best wishes,
Rosanna