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The scleral ring or sclerotic ring is a hardened ring of plates, often derived from bone, that is found in the eyes of many animals in several groups of vertebrates. Some species of mammals, amphibians, and crocodilians lack scleral rings. [1] The ring is in the fibrous outer layer of the eye, called the sclera.
The sclera's blood vessels are mainly on the surface. Along with the vessels of the conjunctiva (which is a thin layer covering the sclera), those in the episclera render the inflamed eye bright red. [6] In many vertebrates, the sclera is reinforced with plates of cartilage or bone, together forming a circular structure called the sclerotic ring.
A circle of bony plates, the sclerotic ring, surrounds the eye and holds it rigid, but an improvement over the reptilian eye, also found in mammals, is that the lens is pushed further forward, increasing the size of the image on the retina. [4] Fields of view for a pigeon and an owl
The eye-ring of a bird is a ring of tiny feathers that surrounds the orbital ring, [5] a ring of bare skin immediately surrounding a bird's eye. [5] [6] The eye-ring is often decorative, and its colour may contrast with adjoining plumage. [4] The ring of feathers is sometimes incomplete, forming an eye arc. In the absence of a conspicuous eye ...
The diameter of the eye socket was 2.8 cm (1.1 in), while the outer diameter of the sclerotic ring was 2.3 cm (0.91 in), and its inner diameter 1.5 cm (0.59 in). The ring consisted of 15 ossicles (small bones also termed plates) which overlapped each other with no gaps, and the rims of the ring were regularly rounded.
Eurhinosaurus had a very large orbit with sclerotic ring, a circular shaped bone that was embedded in their eye. [5] The sclerotic ring was probably used to maintain the shape of their eyes against the high pressure in the deep sea while they were diving. [5] Ichthyosaurs had the biggest eyes of any animal ever known.
A top European Union official says Russia’s invasion of Ukraine has exposed an urgent need to reform the “sclerotic and hobbled” global decision-making at the United Nations. Charles Michel ...
The skull of SAM-PK-5867. Some specimens of Euparkeria preserve bony rings in the eye sockets called sclerotic rings, which in life would have supported the eye.The sclerotic ring of Euparkeria is most similar to those of modern birds and reptiles that are nocturnal, suggesting that Euparkeria had a lifestyle adapted to low-light conditions.