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Fish eyes are similar to the eyes of terrestrial vertebrates like birds and mammals, but have a more spherical lens. Birds and mammals (including humans) normally adjust focus by changing the shape of their lens, but fish normally adjust focus by moving the lens closer to or further from the retina .
Fish vision shows adaptation to their visual environment, for example deep sea fishes have eyes suited to the dark environment. Fish and other aquatic animals live in a different light environment than terrestrial species. Water absorbs light so that with increasing depth the amount of light available decreases quickly.
The upper (dorsal) half of the eye is adapted for vision in air, the lower (ventral) half for vision in water. [2] The lens of the eye also changes in thickness top to bottom to compensate for the difference in the refractive indices of air versus water. The ventral hemiretina is characterized by thicker cell layers containing more sensory ...
The pearleyes are a family, Scopelarchidae, of aulopiform ray-finned fish, distinguished by their unique visual system, with two retinas in each eye. [2]They are small to medium fish, ranging in size from just 3.7 cm (1.5 in) in adult length to 35 cm (14 in) in length, depending on species.
Anableps anableps is a slender elongate fish with very distinct eyes that project prominently from the head. Each eye is divided lengthwise and thus has two pupils; the fish positions itself in such a way that the dividing line between the two parts of the eye lies on the surface of the water, so that one pupil has an aerial view while the other is submerged.
The eyes of Winteria telescopa differ slightly from those of other opisthoproctids by their more forward-pointing gaze.. Barreleyes, also known as spook fish (a name also applied to several species of chimaera), are small deep-sea argentiniform fish comprising the family Opisthoproctidae found in tropical-to-temperate waters of the Atlantic, Pacific, and Indian Oceans.
Hyperoglyphe perciformis, the barrelfish is a primarily bathypelagic species of ray-finned fish belonging to the family Centrolophidae. [2] The barrelfish is found in the Northern Atlantic Ocean. Despite being in the medusafish family, the barrelfish does not associate with jellyfish or other medusae. It is considered a deep-water gamefish. [3]
The name "four-eyed fish" comes from how the eyes of the fish are split into two lobes horizontally, each with its own pupil and vision. This allows the fish to see above and below the water at the same time. [4].Aiding in predator detection and prey location. Additionally, the fish has specialized muscles enabling each eye to adjust its focus ...