This is an incredible fish. Especially when studying vision. To give you some background, this fish is part of a family of Indo-Pacific fishes. There are seven different species within the family. For a long time not much was known about the fish. However there have been EXTREMELY new and recenent research that is exciting and has contributed greatly to the broader research that has been done so far…these fish have the ability to see ultraviolet light. There have been no other deep sea fish that have been found to be able to see ultraviolet light. Evolutionarily it doesn't necessarily make sense. If you are living at the depths of the ocean, why would it be beneficial to develop the ability to see ultraviolet light. Yet, against all odds, these fish can. This is essential to our research that is being conducted into Duke University. Ideally, humans would want to have better eyesight even if it is not necessary for survival.
Did you know that Goldfish have incredible eyesight? A goldfish is the only animal that can see infrared and ultraviolet light! Humans do not even have this ability which makes it even more incredible. Goldfish first came from China. Over the years, several hundred varieties developing over the years.
Vision that is seen in the goldfish may not seem important to many people, but it is actually quite stimulating in that it is much more developed than most people would expect it to be for the size and apparent intelligence of the fish. For example, goldfish have full-spectrum vision which allows them to see the micro-flashes of static electrical charge as well as bio-luminescence that show up when an animal tries to find its prey.
Information found from: http://animal-facts-trivia.blogspot.com/2008/09/goldfish-incredible-eyesight.html
The glasshead barreleye fish (Rhynchohyalus natalensis) lives deep in the sea. Specifically this fish can be found at depths of between 800 metres to 1,000 meters in the Tasman Sea, off the coast of Australia.
This creature has 4 eyes!
It has two primary cylindrical eyes pointing upwards so it can see prey or predators silhouetted against the gloomy light above (it lives really deep in the ocean!). They second set of eyes are on the side of the head. This set has a mirror-like second lens and retina so that it see to the sides and below
The fish's extra pair of eyes give it 360° vision! This is not somethings that humans or many other animals have the ability to do. However, this fish lives deep below the ocean's surface in almost completely black waters.
Information found from: http://www.dailymail.co.uk/sciencetech/article-2587906/The-fish-FOUR-eyes-Deep-sea-creature-360-vision-spot-prey-predators-mates.html