chofetzchaim:
Well for all you know it could have meant looking at a young bear just like you can’t look at engraved letters on a tombstone.
As I side note, I realize why they don’t teach Gemarah to very young children. Can you imagine if your 5 year old learned the gemarah that eating fresh vegetables is harmful to you?
Also if your wives decide its time to cut down on the marrow bones in the chulent, you can tell them that you need it for your eyesight.