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Eye color. Eye color is a polygenic phenotypic trait determined by two factors: the pigmentation of the eye 's iris [1][2] and the frequency-dependence of the scattering of light by the turbid medium in the stroma of the iris. [3]: 9. In humans, the pigmentation of the iris varies from light brown to black, depending on the concentration of ...
Simulated stages of a greyout. A greyout is a transient loss of vision characterized by a perceived dimming of light and color, sometimes accompanied by a loss of peripheral vision. [1] It is a precursor to fainting or a blackout and is caused by hypoxia (low brain oxygen level), often due to a loss of blood pressure.
The word "glaucoma" comes from the Ancient Greek γλαύκωμα, [107] a derivative of γλαυκός (glaukos), [108] which commonly described the color of eyes which were not dark (i.e. blue, green, light gray). Eyes described as γλαυκός due to disease might have had a gray cataract in the Hippocratic era, or, in the early Common Era ...
Waardenburg syndrome is a group of rare genetic conditions characterised by at least some degree of congenital hearing loss and pigmentation deficiencies, which can include bright blue eyes (or one blue eye and one brown eye), a white forelock or patches of light skin. These basic features constitute type 2 of the condition; in type 1, there is ...
As my eyes shut close each night and I stir awake in the early hours of the morning, I pray for my parents’ health and well-being. “Please watch over them, and please give us more time to be ...
Heterochromia iridum. Heterochromia is a variation in coloration most often used to describe color differences of the iris, but can also be applied to color variation of hair [1] or skin. Heterochromia is determined by the production, delivery, and concentration of melanin (a pigment). It may be inherited, or caused by genetic mosaicism ...
The sclera forms the posterior five-sixths of the connective tissue coat of the human eyeball. It is continuous with the dura mater and the cornea, and maintains the shape of the eyeball, offering resistance to internal and external forces, and provides an attachment for the extraocular muscle insertions. The sclera is perforated by many nerves ...
Periorbital dark circles. Minor dark circles and a hint of periorbital puffiness —a combination principally suggestive of minor sleep deprivation. Periorbital dark circles (including dark circles of the lower eyelid) are dark blemishes around the eyes. There are many causes of this symptom, including heredity and bruising.