Just an FYI, the optometry building at PUCO is not in the middle of campus, and it is not shared with undergrads. The only time I've come across undergrads is when I decide to buy lunches at the school's cafeteria, which is awesome.
The clinic right at the school is not typically busy in the summer, but the other clinics associated with the school (there are 5 total), particularly the 2 in Portland itself, stay VERY busy.