I posted this on the thread "mini life crisis", you might want to check that one out. Lots of good info.
I wrestled for a long time between going MD or going OD. My dad and both of his parents were ODs, all practiced together; so obviously there was some incentive to go that way. I had seen how many patients just loved coming in to see them because of the time and attention they got (20 minutes of doctor time wasn't unheard of compared with approximately 3-5 minutes with the local MD (note: just anecdotal)). I liked the idea of going into the family practice, and I really liked the idea of working with eyes (damn but they're interesting little things). What finally made the decision was when I saw how hard Dad had to work to get TPA passed in my state. And then again for the limited orals ODs are allowed. To me, it wasn't worth having to fight so hard to get legal permission to practice within the OD education whereas with an MD, the sky is the limit.
Bottom line, I think being an OD is great IF you don't mind having to fight long and hard for any new levels of practice. You get great patient interaction, normal hours, you can make an immediate difference in people's vision, and can often catch larger problems before anyone else. But as has been said, you can't expect to see new and interesting pathology in every patient you see.
Best of luck to you.
And in your case, I'd suggest one additional thing. You obviously have an interest in eyes: but what area of eyes? If you want to do ANY surgery, go MD. If you are content to spend a good bit of your day refracting perfectly healthy eyes, go OD.