Scientists trace human eye evolution to ancient one-eyed ancestor

Long before language or upright posture, our ancestors perceived the world through a single eye — and scientists have now traced that lineage with remarkable precision. Researchers have identified a tiny, one-eyed ancestral organism as the evolutionary origin of human vision, revealing that the paired, depth-perceiving eyes we possess today emerged through duplication and refinement of a far simpler design. This discovery invites us to see our own sight differently: not as a given, but as a gift assembled slowly across millions of years of biological patience.