I know this has been said already, but I'm just adding in my experiences. 🙂
I shadowed an optometrist for a semester before I began interning, then eventually working, as a tech for a few other optometrists. I can't stress enough the benefits I've received from working for these optometrists. First off, I now have experience with simply talking to patients, which is a pretty big step in itself to me. Secondly, I've learned how to use equipment that we'd eventually learn to use in optometry school. I know I don't know everything, but I feel some relief when I tour optometry schools and recognize something I know how to use. 🙂 Also, learning how to do some of the pre-tests has helped build my confidence, which goes along with knowing how to use the equipment.. any extra knowledge you know is always a step up!
Viewing different modes of practice in optometry is always a good thing to do before considering a career.. but get your hands dirty if you can. 😎
I'm not saying you have to work with an optometrist to be successful, I'm just sharing my experiences and how it's made me feel.