Eye color is defined by that of the iris. National Eye Institute. Most human irises also show a condensation of the brownish stromal melanin in the thin anterior border layer, which by its position has an overt influence on the overall color. Sometimes lipofuscin, a yellow "wear and tear" pigment, also enters into the visible eye color, especially in aged or diseased green eyes. [6][7], In contrast, heterochromia and variegated iris patterns are common in veterinary practice. 1a, Merriam-Webster Dictionary, Encyclopædia Britannica 2006 Ultimate Reference Suite DVD, "Iridology: not useful and potentially harmful", https://en.wikipedia.org/w/index.php?title=Iris_(anatomy)&oldid=978075674, Articles with dead external links from April 2018, Articles with unsourced statements from November 2010, Creative Commons Attribution-ShareAlike License. Some white cat fancies (e.g., white Turkish Angora or white Turkish van cats) may show striking heterochromia, with the most common pattern being one uniformly blue, the other copper, orange, yellow or green. Anastasius the First was dubbed dikoros (having two irises) for his patent heterochromia since his right iris had a darker color than the left one. Sie ist insbesondere berechtigt, Zweigniederlassungen... Aufgrund der aktuellen Situation müssen wir unseren Telefonsupport vorübergehend einstellen. Dann nutzen Sie die Möglichkeit, diesem Firmeneintrag weitere wichtige Informationen hinzuzufügen. The optical mechanisms by which the non-pigmented stromal components influence eye color are complex, and many erroneous statements exist in the literature. Normal pupil size ranges from 2 to 4 mm in diameter in the light to 4 to 8 mm in the dark.. Das Unternehmen wird derzeit von einem Manager (1 x The collarette is a vestige of the coating of the embryonic pupil. The iris is usually strongly pigmented, with the color typically ranging between brown, hazel, green, gray, and blue. This anterior surface projects as the dilator muscles. (Iris labeled at upper right), Genetic and physical factors determining iris color, "eye, human." Die oberen nennen sich Domblätter und sind bei Iris x barbata-nana 'Cats Eye' rot. The iris outer larger circle-circumference does not change size. [1] The outer edge of the iris, known as the root, is attached to the sclera and the anterior ciliary body. It is the most visible part of the eye.
Occasionally, the color of the iris is due to a lack of pigmentation, as in the pinkish-white of oculo-cutaneous albinism,[1] or to obscuration of its pigment by blood vessels, as in the red of an abnormally vascularised iris. 396–397, "Sensory Reception: Human Vision: Structure and function of the Human Eye" vol. All the contributing factors towards eye color and its variation are not fully understood. The circle circumference sphincter constricting muscle is the opposing muscle of the circle-radius dilator muscle. Acute Care Handbook for Physical Therapists, 4th edition. Despite the wide range of colors, the only pigment that contributes substantially to normal human iris color is the dark pigment melanin. Nervous System. A person with brown eyes has the same color of melanin pigment that a person with a blue eye has. Polygenic means that there may be several complicated genes involved that interact to create eye color. Autonomic control of the eye. 2014;6:123-160. doi:10.1016/B978-1-4557-2896-1.00006-8, Ⓒ 2020 About, Inc. (Dotdash) — All rights reserved. Die Iris, auch Regenbogenhaut genannt, ist einzigartig – wie ein Fingerabdruck.
He is an active member of the American Optometric Association.
[1] It is typically defined as the region where the sphincter muscle and dilator muscle overlap. Often in poor lighting, one may mistake amber eyes for brown. Eye color is controlled by three basic genes. FirmenWissen erfüllt die Trusted Shops Kriterien wie Bonität, Kostentransparenz und Datenschutz. Interference is recognised by characteristic dependence of color on the angle of view, as seen in eyespots of some butterfly wings, although the chemical components remain the same. Compr Physiol. Colors other than brown or black are due to selective reflection and absorption from the other stromal components.
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