The very simple eyes of a fruit fly larva can see just enough light to allow the animal’s relatively large brain to assemble that input into images. For comparison, the human eye contains more than 125 million photoreceptors while the eyes of a fruit fly larva have only 24.
“It blows open how we think about vision,” says Barry Condron, a neurobiologist at the University of Virginia.
“This tells us that visual input may not be as important to sight as the brain working behind it. In this case, the brain apparently is able to compensate for the minimal visual input.”
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Photo credit: University of Virginia