Heterochromia is a condition where the coloured part of the eye (iris) are different colours. There are 3 different types of heterochromia eyes.<\/p>\n
This is where each of a person\u2019s eyes is a completely different colour; one eye may be blue and the other brown, for example.<\/p>\n
A person who has two different colours on the same iris. The inner ring of the iris is a different colour to the outer ring of the iris. It is believed that the outer coloured ring is the \u2018true\u2019 iris colour in people with this type of heterochromia.<\/p>\n
Also called partial heterochromia, this is where one section of the iris is a different colour from the rest of the iris. This often presents itself as an irregular spot, rather than a ring, on the iris in one colour while the colour around this spot is different.<\/p>\n
For most, heterochromia is present from birth. This is known as genetic heterochromia. Many cases are sporadic with no family history of the condition. A lot of research has been carried out on this condition, and it is suggested, more often than not, that the condition in humans is benign without any underlying problems. However, some cases of genetic heterochromia link to diseases and syndromes such as; Bourneville disease, Waardenburg syndrome, and Horner’s syndrome, to name a few. Heterochromia can also develop later in life, as acquired heterochromia. Whilst less common than genetic heterochromia, some causes of acquired heterochromia are; diabetes, glaucoma, eye injury, eye surgery, and some medications.<\/p>\n