A blonde went to an eye doctor to have her eyes checked for glasses. The doctor directed her to read various letters with the left eye while covering the right eye.
The blonde was so mixed up on which eye was which that the eye doctor in disgust took a paper sack with a hole to see through, and put it on her head to cover up the appropriate eye and asked her to read the letters.
As he did so, he noticed the blonde had tears streaming down her face. “Look,” said the doctor, “there’s no need to get upset about getting glasses.”
“I know,” agreed the blonde, “but I kind of had my heart set on wire frames.”