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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]
Eye color outside of the iris may also be symptomatic of disease. Yellowing of the sclera (the "whites of the eyes") is associated with jaundice, [82] and may be symptomatic of liver diseases such as cirrhosis or hepatitis. [83] A blue coloration of the sclera may also be symptomatic of disease. [82]
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 .
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]
Gilbert syndrome can sometimes cause the skin or whites of the eyes to turn a yellowish color, per Mayo Clinic. It is a genetic disorder passed on from one or more parents. It is a genetic ...
The cooperative eye hypothesis is not the only one that has been proposed to explain the appearance of the human eye. Other hypotheses include the proposal that white sclerae are a sign of good health, useful in mate selection, or that eye visibility promotes altruistic behaviour by letting people know they are being watched. A study by the Max ...
Graziadei said that the whites of his eyes can sometimes look jaundiced, or more yellow, as a result of the condition. He said it tends to impact him more when he is worn out. "I am healthy.
It is seen as a yellow-white deposit on the conjunctiva adjacent to the limbus (the junction between the cornea and sclera). [3] (It is to be distinguished clinically from a pterygium, which is a wedge shaped area of fibrosis that may grow onto the cornea.) A pinguecula usually does not cause any symptoms.