Eyes of stone.

LiveScience takes a hard look at the stony gaze of the chiton:

While scientists had discovered the hundreds of eye-like structures on the surface of this armored mollusk, called a chiton, decades ago, they didn’t know what they were made of or whether they could actually see objects or just sensed light.

“Turns out they can see objects, though probably not well,” said study researcher Daniel Speiser, who recently became a postdoctoral fellow at the University of California, Santa Barbara.

For comparison, the study found that chiton vision would be the equivalent of humans looking in the sky and seeing a disk the diameter of 20 moons, making human vision about a thousand times sharper than chiton vision, the researchers said.

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