Put it this way, unless you have above a 3.20ish cumulative GPA at your optometry school, then you're going to be put a year behind. None of my 1st year credits from ICO transferred to IAUPR (and I had some A's and B's) and I had to start from scratch. The school also accepted a 3rd year student from NECO and started him as a 2nd year.
When talking to school advisers before going to IAUPR, they all told me it is unlikely that schools accept transfer students unless there were outstanding circumstances (ie; valid reasons for leaving, not just I wanted a change of scenery). The dean of your current optometry school also had to vouch for you and write a letter of recommendation (this was the case for PCO, NECO, and NOVA at least). So long story short, if you are not sure about the school, do not waste your time and money. But at the end everything worked out for the best IMHO. Hope this helps =)