Cats
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ODD EYES (HETEROCHROMIA)
The scientific term for odd eyes is heterochromia iridium (different coloured irides). It can be
genetic (inherited), congenital (development defect) or acquired (illness, injury, medication).
In the cat fancy, odd-eyes means having one blue and one other-colour eye. Odd eyes are
most common in epistatic white cats where one eye is blue and the other is orange, yellow,
brown or green. Pedigree odd-eyed white cats have one blue and one orange/amber eye, but
in randombreds the non-blue eye may be yellow, green or brown. Another form of odd eyes is
found in white cats where one eye has a tapetum lucidum (green eye shine in the dark) and
one eye lacks the tapetum (red eye shine). These different eye shines are seen in reflected
headlights or flash photography. Bicolour cats with a high degree of white on the face may
also have odd eyes.
Heterochromía from birth is common in cats (blue/amber), horses (blue/brown) and some
breeds of dog (blue/brown)
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