The eye is an amazing organ. It enables an organism to translate light into electro-chemical impulses that the brain can assemble into “images” of the world around it. Many types of eyes are known in the living world, and a new study describes one of the most intriguing eye designs yet to be uncovered.

Charles Darwin wrote in 1859, “To suppose that the eye, with all its inimitable contrivances for adjusting the focus to different distances, for admitting different amounts of light, and for the correction of spherical and chromatic aberration, could have been formed by natural selection, seems, I freely confess, absurd in the highest possible degree.”1 Afterward, however, he tried to defend that very premise, not with evidence, but by telling a story about how small changes could add up and “build” an eye.

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