Heterochromia
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Heterochromia (also known as a heterochromia iridis or heterochromia iridium) is an eye 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 genetically inherited or due to mosaicism, or acquired by disease or injury.[1]

COOL!
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It'd be cool do have a green eye and a blue eye

It looks cool, but sometimes it is described as a syndrome.
www.ncbi.nlm.nih.gov/sites/entrez?db=pubmed&uid=1081852&cmd=showdetailview&indexed=google
In 4 cases of heterochromic cyclitis with cataract, 5 cases of herpetic iridocyclitis, and 5 cases of senile cataract, hypersensitivity to both alpha-crystalline and uveal pigment was investigated by lymphocyte-transformation and leukocyte-migration tests. In 3 cases of heterochromic cyclitis with cataracts, cellular hypersensitivity to alpha-crystalline was proven. Basing on these findings, the role of hypersensitivity to lens proteins in the etiology of heterochromic cyclitis is suggested.
www.ncbi.nlm.nih.gov/sites/entrez?db=pubmed&uid=1081852&cmd=showdetailview&indexed=google
In 4 cases of heterochromic cyclitis with cataract, 5 cases of herpetic iridocyclitis, and 5 cases of senile cataract, hypersensitivity to both alpha-crystalline and uveal pigment was investigated by lymphocyte-transformation and leukocyte-migration tests. In 3 cases of heterochromic cyclitis with cataracts, cellular hypersensitivity to alpha-crystalline was proven. Basing on these findings, the role of hypersensitivity to lens proteins in the etiology of heterochromic cyclitis is suggested.
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ok a guy at my work has this thing

Well, bad luck for him then...