Which known creature has the largest eyes in the world?

The colossal squid ("Mesonychoteuthis hamiltoni") is part of the family "Cranchiidae". It is sometimes called the Antarctic squid or giant cranch squid and is believed to be the largest squid species in terms of mass. It is the only recognized member of the genus "Mesonychoteuthis" and is known from only a small number of specimens. The species is confirmed to reach a mass of at least 495 kilograms (1,091 lb), though the largest specimens—known only from beaks found in sperm whale stomachs—may perhaps weigh as much as 600–700 kilograms (1,300–1,500 lb), making it the largest-known invertebrate.

The colossal squid has the largest animal eyes ever studied. It possibly has the largest eyes that have ever existed during the history of the animal kingdom. In a living colossal squid they measure about 27 cm (10.6299 inch) across—about the size of a soccer ball. Another incredible feature of the colossal squid is that the eyes are equipped with light organs.

Vision is very important to colossal squid. They use their eyes to see and catch prey, to watch for predators, and to see each other. With huge eyes and built-in headlights, the squid is well equipped for life in the dark depths of the Southern Ocean. The colossal squid's eyes are placed so they face forward, giving the squid binocular, or stereoscopic, vision. It can see forwards and behind to detect predators, but does not have the binocular vision needed to judge distances.