If I remember right, that's how Clark missed military service in WW2 comics - he was nervous when he took the test and accidentally looked through the wall and read the chart in the next room, so they failed him.
Marcus L. Rowland Forgotten Futures, The Scientific Romance Role Playing Game
By the way, who are the people in the pictures on the wall next to the eye chart? I believe that one of them is Cyclops (tee hee.) Who's the green fuzzy monster-type? And the other one? Anyone have any ideas?
I think the upper right one is supposed to be Reed Richards - Mr. Fantastic of the Fantastic Four. His power is that he can stretch his body into different shapes. If you look at the neck of the person depicted, you will see that it is unnaturally long.