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Via LiveScience:

A tiny sea mollusk uses eyes made of a calcium carbonate crystal to  spot predators lurking above, researchers say of the first such rocky  lenses found in the animal kingdom.
 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.
 Chitons first appeared on Earth more than 500 million years ago. But  according to the fossil record, the oldest chitons with eyes didn’t  emerge until the last 25 million years, making their eyes among the most  recent to evolve in animals.

Via LiveScience:

A tiny sea mollusk uses eyes made of a calcium carbonate crystal to spot predators lurking above, researchers say of the first such rocky lenses found in the animal kingdom.

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.

Chitons first appeared on Earth more than 500 million years ago. But according to the fossil record, the oldest chitons with eyes didn’t emerge until the last 25 million years, making their eyes among the most recent to evolve in animals.