During World War II, the British Royal Air Force boasted an impressive accuracy in intercepting Nazi German bombers despite the cover of darkness at night. The British air ministry reported that their fighter pilots ate a large amount of carrots to boost their night vision. Since then, it has become public knowledge that carrots help you see better in the dark.
Unfortunately, this is false. The British air force were not actually using carrots to help see better in the dark; they were using a revolutionary new technology called radar to spot enemy war planes from a far distance. The carrot propaganda was spread to hide this fact from the Germans.
The carrot myth sounds plausible as carrots contain a large amount of beta-carotene, which is converted into vitamin A in the body. Vitamin A is a key chemical required for vision, in the form of retinal. It is true that vitamin A deficiency can cause night blindness. However, the dose of vitamin A required to improve your night vision is so high that it cannot be achieved by simply eating a lot of carrots.