Carrots are a great source of Vitamin A. Vitamin A deficencies can result in poor eyesight and other occular conditions. However eating more carrots and taking Vitamin A supplements does not improve vision.
The rumor about carrots improving eyesight was started as a part of disinformation campaign in the 1940's. The Royal Air Force was using an early form of radar and did not want the Nazis to know anything about this new technology. So to explain why British pilots had such an impressive records of hitting their targets, the Home Office explained that the pilots were eating large amounts of carrots.
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