Actually, I number of US Optometry schools will accept OAC English in lieu of a full year at university.
THe ones I know of are PCO, SUNY, ICO, NECO, and MCO. If you choose to use OAC to fill the requirements you will have to submit your high school transcript as well. If in doubt, ask the admissions office. Also, SUNY will also take OAC Calculus in place of their university requirement!