A man went to an eye specialist to get his eyes tested and asked, "Doctor, will I be able to read after wearing glasses?"
"Yes, of course," said the doctor, "why not!"
"Oh! How nice it would be," said the patient with joy, "I have been illiterate for so long."
If you think that's funny, check out this eBay auction for a vintage cardboard eye chart. It was produced by American Optical and has No. 1930 on the bottom.