Stevie Wonder's Wife

Q: Have you ever seen Stevie Wonders wife?
A: Neither has he.

Can't See

Patient to optometrist: I'm very worried about the outcome of this operation, doctor. What are the chances?
Optometrist to patient: Don't worry, you won't be able to see the difference.

Dog Vision

A blind man is at the optometrist’s with his guide dog. Both are facing the eye test chart on the wall. The optometrist takes the guide dog away, replaces it with another guide dog, and asks, “Is that better or worse?”