Eye still don't get it

J: Ok Beck, it's not opathomogist. Let's think of it this way: What kinds of visual illusions can you think of?
B: Huh? Oh, ok... Like obstacle?
J: What?
B: Like obstacle illusions?

Eye don't get it

B: My friend is a opathomologist.
J: A what?
B: You know, an eye doctor.