I just finished my first year and I didn't study prior to optometry school but looking back, with all free time I had prior to school starting I would have reviewed optical optics. At berkeley, we spend the first 2 years taking several optics courses and at some points it was very challenging. But i'm not sure how much optics is a focus at other schools but if you feel like preparing, I would. It's definitely not a 'nerdy' option, I think its totally respectable. Depending on which school you are going to, I would contact an upperclassmen or first year student to see if they have any material that they would be willing to send you to get a head start. Its definitely not a bad way to start opto school 🙂