When I was at SUNY interviewing, I asked about their combined programs in OD/Vision Science and they told me that students who do those are generally interested in a research/teaching career rather than a clinical one. (Anyone who does it is definitely interested in a long career being a *student*, anyway!)
I'm not sure about other schools, but SUNY has combined OD/MBA and OD/MPH programs. I can see how either of those might be useful if you planned a career combining clinical practice with business ownership or administration.