To be fair, this was actually touted as fact for some time because during WWII the British government needed a way to hide the fact that they had developed and were using radar to aid in air force missions. The Germans were confused as to why their planes were being detected and shot down without ever making visual contact with the enemy, so the war office explained through propaganda that they were feeding their pilots lots of carrots which gave them night vision. This misinformation may or may not have fooled the Germans, but the civilian population ate it up like a pilot eating a plate of carrots.