“There is one species that has only one eye naturally and they are from a genus called copepods.” Unlike the mythical one-eyed giant Cyclops, these real-world creatures are pretty small. In fact, some copepods are even smaller than a grain of rice.
Some fish, amphibians and reptiles have a simple third eye on top of the head. This patch of light-sensitive cells doesn't add much to their vision, but it helps some animals to regulate their body temperature and navigate via the Sun's light.
Almost every living organism in the animal kingdom share several physical characteristics. Most have one heart, two lungs, two eyes, two ears, two noses, one mouth, etc.
Polyphemus, in Greek mythology, the most famous of the Cyclopes (one-eyed giants), son of Poseidon, god of the sea, and the nymph Thoösa. According to Ovid in Metamorphoses, Polyphemus loved Galatea, a Sicilian Nereid, and killed her lover Acis.
Cyclops, (Greek: “Round Eye”) in Greek legend and literature, any of several one-eyed giants to whom were ascribed a variety of histories and deeds.
Cyclopes (singular: Cyclops), one-eyed giants in Greek mythology, including Polyphemus. They had a single eye in the centre of their forehead.
Antigonus I Monophthalmus (382–301 BC), Macedonian nobleman, general, satrap and king, founder of the Antigonid dynasty. John the One-Eyed, a secular priest murdered in 1233. Sitric Cáech (died 927), Viking ruler of Dublin and Viking Northumbria. Egbert the One-Eyed (died 994), German count.
Oni・おに is often translated as “ogre” or “demon”. It's a sub-class of Yōkai, and is often identified by one eye, two or one horn on their forehead. Oni are basically fantastic weird creatures, which appear in folktales, legends, and, more recently, in manga, anime, and film.
What has one eye but cannot see? Answer: A needle.
The image of Shiva, as portrayed among Hindus, contains common symbols representative of his superiority. One of these symbols is his third eye, seen in the centre of his forehead; hence he is often referred to as Tryambaka Deva (literally meaning “three-eyed lord”).
And there is even a lizard-like animal in New Zealand that naturally has three eyes. This three-eyed animal is called a tuatara. The third eye of a tuatara, located on the top of its head, has all of the right parts: a lens, a retina, and nerves leading to the brain.
While modern arachnids, like scorpions and spiders, do not possess these particular otherworldly features, there is a one remarkable physical feature that some modern scorpion species do possess–12 separate eyes.
Another clam, known as the disco clam (Ctenoides ales), has about 40 eyes. But its vision is poor; it couldn't even detect flashing reflected from a nearby disco clam, according to research covered by Live Science.
Ocean creatures are known for their weird eyes, but scallops have one of the weirdest visual systems of all. These marine bivalves (above) have up to 200 eyes, and each of them uses a mirror instead of a lens to focus light.
Summary: Box jellyfish may seem like rather simple creatures, but in fact their visual system is anything but. They've got no fewer than 24 eyes of four different kinds.
Answer: A River!
Humans have two eyes but the final image obtained is one. Both eyes are used for gathering information about our surroundings. Having two eyes comes with various advantages and the main advantage is that we can see the world in three dimensions. The depth and distance can be seen because of the positions of the eyes.
The bakeneko! Literally "cat-monster", the bakeneko is a yôkai (spirit of Japanese folklore) taking on the appearance of a long-tailed cat. This tail would allow it to walk on two legs, and some special abilities like speech, metamorphism, and even the resurrection of the dead!
Demonic Kormoses [also called "Sokor Körmös" (blind angel)], who commonly dwell in the underworld and harm humans, are controlled by Erlik. Remaining Kormoses are those who are not particularly good or evil and roam the Earth while suffering in a pathetic state.
Wolf yōkai (妖狼, Yōrō, "demon wolves") are demons who resemble wolves. The ones that have a humanoid appearance have fangs and pointed ears, and the ones that aren't humanoid look like wolves slightly larger than the regular wolf, and have the ability to speak.
Mantis shrimps (Stomatopoda)
Mantis shrimps probably have the most sophisticated vision in the animal kingdom. Their compound eyes move independently and they have 12 to 16 visual pigments compared to our three.
Humans have two eyes, but we only see one image. We use our eyes in synergy (together) to gather information about our surroundings. Binocular (or two-eyed) vision has several advantages, one of which is the ability to see the world in three dimensions.
Asymmetrical eyes are common and often not cause for concern. A person may have one eye bigger than the other due to genetics, age, and lifestyle factors, among other causes. In rare cases, having asymmetrical eyes may indicate an underlying medical condition. Most of the time, however, this is not a cause for concern.