What turned me to optometry was the amount and quality of patient interaction. I'm genuinely interested in working with people without coming across as someone with a lot of power, yet having the knowledge to better a patient's health in some capacity. Now I'm not here to say other health professionals think they are positions with power, etc, but after spending time with optometrists and physicians/surgeons, I got the impression most physicians thought they were well above patients, and also wanted to get the patient in and out as fast as possible. I experienced this myself numerous times when I had appointments (with a general surgeon) for personal medical conditions. Most optometrists on the other hand always seemed to 'have time' for their patients, despite the fact that they too probably had to fit in as many patients as possible per day. Having said that, I'm sure there are plenty of optometrists who aren't that great, so perhaps my good experiences with optometrists have shaped the way I think.
I had considered pharmacy, but I just didn't think that would be a profession that would challenge me on a daily basis. I've always been more interested in working with patients one on one, and for me, most forms of pharmacy don't offer that. As for dentistry, I've just never been interested really.