BOptom is usually a UK designation for an undergraduate degree. OD at UC Berkeley is a graduate degree. You have to have your bachelors already and you have to be admitted first to the Graduate Divsion of UCB and then to the optometry school of Berkeley. The graduate designation of the OD degree is not universial in the US, though.
Some schools in the US may grant 1 or 2 years advanced standing in their programs for holders of B Optom degrees for practicing in the US.