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The eye is 27 cm (10 + 1 ⁄ 2 in) wide, with a lens 12 cm (4 + 1 ⁄ 2 in) across. This is the largest eye of any known animal. [30] These measurements are of the partly collapsed specimen; alive, the eye was probably 30 [31] to 40 cm (12 to 16 in) across. [57] Inspection of the specimen with an endoscope revealed ovaries containing thousands ...
Consequently, many molluscs may have a multitude of eyes in more unlikely places, such as along the edge of their shell. [1] Chitons have a dispersed network of tiny eyes over the surface of their shells which may act together as a compound eye. [1] Many gastropods have stalked eyes; the eye can be retracted into the stalk itself in the ...
This is three times the size of the largest fish eyes—up to 90 mm (3.5 in) in swordfish—and more than twice the diameter of the largest whale eyes—up to 109 mm (4.3 in), 61 mm (2.4 in), and 55 mm (2.2 in) in blue, humpback, and sperm whales, respectively—which are the largest among vertebrates. [5]
The tapetum lucidum, in animals that have it, can produce eyeshine, for example as seen in cat eyes at night. Red-eye effect, a reflection of red blood vessels, appears in the eyes of humans and other animals that have no tapetum lucidum, hence no eyeshine, and rarely in animals that have a tapetum lucidum. The red-eye effect is a photographic ...
Nocturnal animals (for example, tarsiers) and animals that live in open landscapes have larger eyes. The vision of forest animals is not so sharp, and in burrowing underground species (moles, gophers, zokors), eyes are reduced to a greater extent, in some cases (marsupial moles, mole rats, blind mole), they are even covered by a skin membrane.
The eye of a bird is larger compared to the size of the animal than for any other group of animals, although much of it is concealed in its skull. The ostrich has the largest eye of any land vertebrate, with an axial length of 50 mm (2.0 in), twice that of the human eye. [1] Bird eye size is broadly related to body mass.
However, "eyes" in gastropods range from simple ocelli that only distinguish light and dark, to more complex pit eyes, and even to lens eyes. [24] In land snails and slugs, vision is not the most important sense, because they are mainly nocturnal animals.
The parabolic mirror eyes typically have a diameter of about 3 mm (0.12 in), look out through transparent sections of the carapace, [19] and appear silvery or golden in colour. [ 10 ] [ 14 ] Their eyes are the most elaborate known from ostracods, [ 20 ] and are better at gathering light than the eyes of any other animal (although the resolution ...