Giant and colossal squids have eyes as big as basketballs, and a Duke scientist thinks he knows why. "They're most likely using their huge eyes to spot and escape their predators, sperm whales," said Duke biologist Sonke Johnsen.To explain the squids' eye size, Johnsen and his collaborators first measured giant and colossal squid eyes using photos and captured animals. The squids eyes are much larger than the swordfish, even though they are about the same size. They use it for defense in low light conditions, the contrast in larger eyes is much better for low light, where squids are usually found.
click here for the link I used.
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