Well, an element in carrots, keratin improves eyesight, but you have to eat an excessively HUGE amount of carrots to raise keratin levels enough to notice a slight change in eyesight, but it's a lot of carrots.

If you eat too many carrots, especially as a kid, your skin takes on an orange glow from keratin buildup- not harmful, but funny looking. As you age, your body improves its ability to digest keratin, resulting in less of an orange pigment.