![]() ![]() LEARN MORE ABOUT the causes of heterochromia. When heterochromia is acquired, it may be the result of: Less commonly, heterochromia can occur later in life due to disease, injury or the use of certain medications. ![]() But it can also point to an underlying condition. Heterochromia is usually harmless when present from birth or early development ( congenital heterochromia). Along with other domestic animals, these dogs experience the same genetic phenomenon as humans. At some point, you’ve probably noticed a Siberian husky, Australian shepherd or border collie with two different-colored eyes. Of the common eye colors, brown eyes have the most melanin and blue eyes have the least.Īnimals can have heterochromia, too. This random genetic “surprise” affects the melanin levels in different parts of the iris(es). The mutation is benign, meaning that it doesn’t relate to an underlying disease or illness and won’t cause any harm. SEE RELATED: The mystery surrounding hazel eyes What causes heterochromia?Ī genetic mutation is believed to cause almost all congenital forms of heterochromia. A pigment within the iris called melanin gives eyes their distinct color. Heterochromia is a rare condition that affects the iris, the colored part of the eye. If you’ve ever asked, “What is it called when you have different-colored eyes?, ” the answer is heterochromia. For example, one eye is brown and the other eye is green. It can also mean there are at least two different colors in parts of one eye or both eyes. In many cases, this means each eye is a different color. Contact us to schedule an appointment.Heterochromia is when someone has more than one eye color. Whether you need a standard eye exam, new contact lenses, or corrective surgery, we will keep you and your family informed and protected so you can pursue the right treatments. We take a consultative, one-on-one approach to family eye care, working alongside you to manage your vision eye health needs. Protect Your Eyes with Complete Eye Care of MedinaĬurious about your eyes? The local vision care specialists at Complete Eye Care of Medina have the technology and diagnostic experience to help correct any vision issues and clarify any questions you may have. As the light reflects across the fibers of the eye, we see a wide scale of colors, with each being uniquely beautiful. In reality, the variance in these colors is simply due to the level of melanin in an individual’s system and the unique shape and configuration of their irises. Across the world, there are also extremely rare colors such as amber, gray, and violet! 25% have blue, 18% have hazel, and less than 9% have green. In the United States, just under 50% of people have brown eyes. Blue eyes emerged as a result of a genetic mutation that caused an individual to produce less melanin than normal, and thus the recessive blue-eyed gene was born.įast forward to today, and the population is much more varied. For example, it is widely agreed that 10,000 years ago, all humans had brown eyes. While current models that take these genetic components into account can predict eye color of offspring relatively consistently, there is still room for error.įurthermore, genetic mutations (unforeseen changes in the genetic code) can create even more possibilities. While it was once thought that a single gene determined eye color, with brown dominating blue, further research has concluded over time that 11 or more genes have some impact on the expression of this trait. To dig into the nitty gritties, a wide variety of genes have an effect on eye color. The color of one’s eyes are directly related to the amount of melanin their body produces, which is determined by genetics. While certain regions of the world have similar eye colors, this reality is due more to genetic clustering of like individuals rather than the region having an impact on the eyes. There are no external factors such as geography or sun exposure that have any meaningful impact on expressed eye color. In simplest terms, eye color is determined entirely by genetics. This ring surrounding the pupil contains varying levels of melanin – the pigment responsible for hair and eye color – from person to person. The region of your eyes that holds color is called the iris. The answer lies deep in your DNA, and is decided long before you are even born. While eye color is highly variable amongst the population, and the patterns within the eye can be very complex, there is very little that an eye exam could tell you about how your eyes got their color. Along with being an identifiable feature listed on drivers licenses, eye color can be a distinguishing attribute that shows family resemblance or even makes someone appear more attractive.
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