Research Suggests Human Eyes Evolved from Ancient Single-Eyed Vertebrate

New research proposes that the earliest vertebrate ancestor, a small worm-like creature with a single central eye, lived nearly 600 million years ago. This ancient 'cyclops' is believed to have influenced the evolution of all vertebrate eyes, including those of humans. The study suggests that parts of this median eye may persist today as the pineal gland, which regulates sleep.