A mollusk whose body is covered in eyes made of stone

Not all wight have diffused squishy optic like us mammals — the shellfish know as chitons have century of archaic visual sensor all over their torso , andthey’re made of a rock called aragonite .

We ’ve known for a while that some mollusks use calcite for lenses , but this is the first time aragonite has been spotted . These stony receptive organs , according to scientist , “ function as small camera eye with an angulate resolution of about 9 ° –12 ° . ” Human visual sense is about a thousand time sharper .

The heart are thought to have take a entirely different evolutionary path to the ones that lead to vertebrate vision . They may have low solution , but these rock peepers do have one advantage : They have two refractive indices , allow them to focus equally well in and out of water .

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