Over 500 Million Years Ago, Early Vertebrates Had Four Eyes That Could See 360 Degrees: During the Cambrian, when evolution was experimenting all sorts of strategies, early vertebrates may have had four eyes, and they were high-res eyes, too.

https://www.zmescience.com/science/biology/over-500-million-years-ago-early-vertebrates-had-four-eyes-that-could-see-360-degrees/

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