As a first-year in college, look at this thread:
http://forums.studentdoctor.net/showthread.php?t=610471
In answer to your questions, in particular, look at the class profiles. It lists average GPAs, OAT scores, and if a degree is required or not at specific colleges.
Most of the colleges do not require a degree, but the completion of a degree is preferred. I'm not an adcoms, but from my perspective, having a completed bachelor's shows you can commit to a program and finish it.
Since you are a freshman, and looking at your username, I assume you are turning 19 this year. Regardless of your credits and prereqs, you may be viewed as young, which can be a negative to adcoms.
Even though you knocked out a lot of your prereqs in your college prep high school (or whatever they're called), I would do at least 2 or 3 years in college. It'll make you more mature, responsible, and you will be able to get better recommendation letters from a distinguished professor. A couple years in college will make you much more prepared to handle optometry school.