My heart set...

A certain old gentleman thought his eyesight was going bad, and he was advised to go to see an eye doctor. He goes in to see the doctor, and the doctor said, "All right, let's check you out. You sit down here on this stool. You put your right hand over your right eye and read that chart on the wall over there." He puts his left hand over his left eye. The doctor says, "No, no, no. Put your right hand over your right eye." This old person puts both hands over both eyes. The doctor is now getting upset. The patient continues to screw up, and the doctor really gets mad and says, "All right, I'll fix you!" He gets a paper bag out of the closet, puts one hole in it, puts it over his head, and says, "Now, read that chart!" The guy read it perfect! The doctor takes the bag off, and this old person starts crying like a baby. The doctor says, "Now, what the hell is wrong with you?" "Well, when I first came in here, I had my heart set on wire frames!"