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Leukocoria (also white pupillary reflex) is an abnormal white reflection from the retina of the eye. Leukocoria resembles eyeshine , but leukocoria can also occur in animals that lack eyeshine because their retina lacks a tapetum lucidum .
The sclera, [note 1] also known as the white of the eye or, in older literature, as the tunica albuginea oculi, is the opaque, fibrous, protective outer layer of the eye containing mainly collagen and some crucial elastic fiber. [2] In the development of the embryo, the sclera is derived from the neural crest. [3]
Scleritis is a serious inflammatory disease that affects the white outer coating of the eye, known as the sclera. The disease is often contracted through association with other diseases of the body, such as granulomatosis with polyangiitis or rheumatoid arthritis. There are three types of scleritis: diffuse scleritis (the most common), nodular ...
In the Iliad, the Greek goddess Athene is said to have gray eyes (γλαυκῶπις). [68] Under magnification, gray eyes exhibit small amounts of yellow and brown color in the iris. Gray is the second-rarest natural eye color after green, with 3% of the world's population having it. [69]
Poliosis circumscripta, commonly referred to as a "white forelock", is a condition characterized by localized patches of white hair due to a reduction or absence of melanin in hair follicles. Although traditionally associated with the scalp, poliosis can affect any hairy area on the body, including eyebrows, eyelashes, and beards.
Ferrets with Waardenburg syndrome have a small white stripe along the top or back of the head and sometimes down the back of the neck (known as a "blaze" coat pattern), or a solid-white head from nose to shoulders (known as a "panda" coat pattern). Affected ferrets often have a very slightly flatter skull and wider-set eyes than healthy ferrets.
A greyout may be experienced by aircraft pilots pulling high positive g-forces as when pulling up into a loop or a tight turn, which forces blood to the lower extremities of the body and lowers blood pressure in the brain. [2]
Thus, the proper term for the yellowing of "white of the eyes" is conjunctival icterus. [18] A rare sign of jaundice in childhood is the appearance of yellowish or greenish teeth. In developing children, hyperbilirubinemia can lead to yellow or green tooth discoloration as bilirubin deposits during tooth calcification. [19]