Search results
Results from the WOW.Com Content Network
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.
Nocturnal birds have eyes optimised for visual sensitivity, with large corneas relative to the eye's length, whereas diurnal birds have longer eyes relative to the corneal diameter to give greater visual acuity. Information about the activities of extinct species can be deduced from measurements of the sclerotic ring and orbit depth.
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 ...
Eye ring may refer to: eye ring, also called a "lover's eye ring", an antique type of ring; eye-ring, a circle of tiny, contrasting feathers that outline the eyes of some birds. limbal ring, a dark ring around the iris of the eye, where the sclera meets the cornea. periorbital dark circles, dark blemishes around the eyes.
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.
The Eye The eye at the top of the pyramid is the dollar bill's biggest puzzles. Many believe the eye represents the presence of God watching over America. Those who like conspiracy theories ...
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.