In anatomy, heterochromia refers to a difference in coloration, usually of the irises but also of hair or skin.

Heterochromia (also known as a heterochromia iridis or heterochromia iridium) is an ocular condition in which one iris is a different color from the other (complete heterochromia), or where part of one iris is a different color from the remainder (partial heterochromia or sectoral heterochromia). It is a result of the relative excess or lack of pigment within an iris or part of an iris, which may be inherited or acquired by disease or injury.Imesch PD, Wallow IH, Albert DM. "The color of the human eye: a review of morphologic correlates and of some conditions that affect iridial pigmentation." Surv Ophthalmol. 1997 Feb;41 Suppl 2:S117-23. PMID 9154287.

Eye color, specifically the color of the irises, is determined primarily by the concentration and distribution of melanin pigment within the iris tissuesWielgus AR, Sarna T. "Melanin in human irides of different color and age of donors." Pigment Cell Res. 2005 Dec;18(6):454-64. PMID 16280011.Prota G, Hu DN, Vincensi MR, McCormick SA, Napolitano A. "Characterization of melanins in human irides and cultured uveal melanocytes from eyes of different colors." Exp Eye Res. 1998 Sep;67(3):293-9. PMID 9778410. ^*. Consequently, anything affecting those factors may result in a difference of color being observed.

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I just took "What does your eye color mean?" and got: Heterochromia ( a different color for each eye )! Try it: http://bit.ly/5pABsa
xcaligirliex (Carly Messig) Sun, 06 Dec 2009 07:06:47 -0000
I just took "What does your eye color mean?" and got: Heterochromia ( a different color for each eye )! Try it: http://bit.ly/5pABsa
@arthurz5 Haha! I guess so!! I love his eyes! He's so lucky to have Heterochromia!!! ^ ^
The_Unraveling (Rise Against!(:) Sun, 06 Dec 2009 06:25:35 -0000
@arthurz5 Haha! I guess so!! I love his eyes! He's so lucky to have Heterochromia!!! ^ ^
@zzz_san 全く同感でした。いみふ　RT @zzz_san: なんで抽選会の放送中に、組み合わせ決定のニュース速報が流れるんだよ。
heterochromia (heterochromia) Fri, 04 Dec 2009 21:29:10 -0000
@zzz_san 全く同感でした。いみふ　RT @zzz_san: なんで抽選会の放送中に、組み合わせ決定のニュース速報が流れるんだよ。
抽選会待ち
heterochromia (heterochromia) Fri, 04 Dec 2009 15:42:28 -0000
抽選会待ち
Dreamt about a girl with an special case of heterochromia. Her eyes were brown when she looked down, blue when up, shifting separately. Huh.
marcuse (Marcus Ekelund) Fri, 04 Dec 2009 08:17:47 -0000
Dreamt about a girl with an special case of heterochromia. Her eyes were brown when she looked down, blue when up, shifting separately. Huh.
@Becky - heterochromia: i was totally about to send you an email letting you know i was working on one. XD... http://tumblr.com/xfb4g0afh
NEWSPAPERTAXIES (Rebecca Earnest) Fri, 04 Dec 2009 06:49:10 -0000
@Becky - heterochromia: i was totally about to send you an email letting you know i was working on one. XD... http://tumblr.com/xfb4g0afh

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