Considering the avg. gpa to get into most OD school is 3.4-3.5 gpa, you will need about a 350 out of 400. Schools take into account where you went for your undergrad. So hopefully your 3.0 is not from university of margaritas. 🙂
curious....
Were you a pre-med student? If that is the case, please don't apply to optometry school. You won't be happy even if you get in. The odds of you getting into an osteopathic school is probably greater than getting into optometry school. good luck.