hello, i need advice on a visual aid i could use for a speech i have to do over the career of optometry, like a optometrist the kind of people u go get eye exams and they prescribe u glasses and stuff, im doing it monday and i was wondering if u could help me think of a visual aid i could use that is easy to get and would be good, im just basically telling how to get started as optometrist and what a optometrist does