I think a lot of people believe their loosely-defined passion towards wanting to help people will get them through whatever obstacles may come their way in professional school. And for some people, maybe that is the case. However, after only going through less than a semester of optometry school, I can say without reservation or doubt that if I didn't love the sciences, I would have dropped out.
And to be fair to scoffman4, s/he stated s/he had never really STUDIED math or science, not that s/he studied it and knew s/he didn't like it. I definitely didn't see myself liking biology until I was actually sitting in a biotech class that was related to my first major. Also, while it makes it much easier to get through if you love ALL the related sciences, if you have an interest in certain aspects, it is often enough to get you through the rest. For example, many people love biology and excel in the biology related courses, but can't stand physics so optics isn't something they look forward to studying. However, what I have noticed is that since its all one related system, even if you don't love physics, it can still be really interesting to learn about how the optics works.