Note: not for the squeamish or easily offended. No disrespect intended to the living or the dead.
The Cyclops we know from mythology has never been proven to exist, Though even today babys are being born with this condition. In the last few years I have read reports from India, Nigeria, and Russia to this effect.
Cyclopia (also cyclocephaly or synophthalmia) is a rare form of holoprosencephaly and is a congenital disorder (birth defect) characterized by the failure of the embryonic prosencephalon to properly divide the orbits of the eye into two cavities. Its incidence is 1 in 16,000 in born animals, and 1 in 250 in embryos, one in 2,500 that end in miscarriage.