Forum:Lenny's Eye

So we all know Lenny has eye problems which have been referenced in a few episodes. Can anyone tell me which episodes?? I know I've seen them, but can't recall the specific episodes. There the one where he says "Dr. said not to get jigs in my eye" while the Simpsons are working on a jigsaw puzzle. And I know there've been a few other references. Please advise. Thanks!