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===Different colors in the two eyes=== {{main|Heterochromia}} [[Image:Heterochromia.jpg|thumb|right|240px|Example of [[heterochromia]] β one eye of the subject is brown, the other hazel.]] Heterochromia (also known as a heterochromia iridis or heterochromia iridum) is an ocular condition in which one iris is a different color from the other iris (complete heterochromia), or where the part of one iris is a different color from the remainder (partial heterochromia or sectoral heterochromia). Uncommon in humans, it is often an indicator of ocular disease, such as chronic iritis or diffuse iris melanoma, but may also occur as a normal variant. Sectors or patches of strikingly different colors in the same iris are less common. [[Anastasius I of the Byzantine Empire|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.<ref>{{Cite journal|last=Baldwin|first=Barry|title=Physical Descriptions of Byzantine Emperors|date=1981|journal=Byzantion|volume=51|issue=1|pages=8β21|jstor=44170668|issn=0378-2506}}</ref><ref>{{Cite journal|last1=Fronimopoulos|first1=John|last2=Lascaratos|first2=John|date=1992-03-01|title=Some Byzantine chroniclers and historians on ophthalmological topics|journal=Documenta Ophthalmologica|language=en|volume=81|issue=1|pages=121β132|doi=10.1007/BF00155022|pmid=1473460|s2cid=26240821|issn=1573-2622}}</ref> In contrast, heterochromia and variegated iris patterns are common in veterinary practice. [[Siberian Husky]] dogs show heterochromia,<ref name="hc">{{Cite web |url=http://www.environmentalgraffiti.com/featured/heterochromia-animals/18455 |title = Heterochromia in Animals | website = Environmental Graffiti | last = Fabricius | first = Karl |access-date=2010-10-27 |archive-url=https://web.archive.org/web/20100923005934/http://www.environmentalgraffiti.com/featured/heterochromia-animals/18455 |archive-date=2010-09-23 |url-status=dead }}</ref>{{better source needed|reason=Original source lists three Wikipedia pages as sources, thus a possible source of [[citogenesis]]|date=March 2021}} possibly analogous to the genetically determined [[Waardenburg syndrome]] of humans. 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.<ref name="hc"/> Striking variation within the same iris is also common in some animals, and is the norm in some species. Several herding breeds, particularly those with a [[Merle (coat color in dogs)|blue merle]] coat color (such as [[Australian Shepherd]]s and [[Border Collie]]s) may show well-defined blue areas within a brown iris, as well as separate blue and darker eyes.{{Citation needed|date=November 2010}} Some horses (usually within the white, spotted, palomino, or cremello groups of breeds) may show amber, brown, white and blue all within the same eye, without any sign of eye disease.{{Citation needed|date=November 2010}} One eye with a white or bluish-white iris is also known as a "walleye".<ref>"walleye", def. 1a, Merriam-Webster Dictionary</ref>
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