A blind man goes to the doctor, who explains to him that there is a new procedure that will restore his sight.

 A blind man goes to the doctor, who explains to him that there is a new procedure that will restore his sight.  

“But,” says the doctor, “You may have a hard time maintaining an erection after.”

So the blind man asks if that is a common side effect, and the doctor says, “No, your wife is ugly.”