Heterochromia is a condition in which mutation of genes that effect pigmentation of the skin (through melanin) and there is too much or too little melanin present. This results in a difference in color of the eyes, as well as the skin and hair. The reason for wanting to know more about the statistics surrounding this condition is probably because of the fact that some think it can make those effected more attractive (or, at least, seemingly more intriguing and unique). Here, we will explore what little is known about central heterochromia statistics, the condition which results in two-tones around the iris of the eyes.
No Certain Data
There is really no particular data about this condition, as studies have really not been conducted. Some statisticians estimate that about 1% of the entire world’s population might be effected. In some cases, people are born with this trait. In other patients, the change may be due to glaucoma, injury, irritation, which may or may not be caused by a foreign object, hemorrhage, tumors on the spine, or even hereditary conditions that can also affect the skin and hair, as well as hearing.
In Other Animals
Other animals may also develop heterochromia. Cats are often associated with this condition, but normally do not show signs of central heterochromia. Instead, they exhibit complete heterochromia. This means that one eye will seem just fine while the other appears blue. Breeds of cats this is seen in often include Turkish Angora and Van, as well as Khao Manee. Japenese Bobtail cats may also sometimes have this issue. Dogs with coats known as merle coats (mottled coloration) are more likely than other dogs or breeds to have this condition, although Huskies, who do not have merle coats, can be effected.
Some see partial, complete, or central heterochromia as somewhat attractive or intriguing because it does occur so rarely. Quite a few actors have had this condition, as have important political figures, musicians, and others. Examples include Christopher Walken, Simon Pegg, Jane Seymour, and Mila Kunis. This condition is, most likely, only appealing because it does not often (when familial) have anything to do with larger health problems, but is just an anomaly that can make the patient seem different than others. In some cases, patients with this condition may need to see a doctor, but only if their eyes seem extremely irritated.