Why do eye colors change?

The color of a person's eyes is determined by several factors, including the amount of melanin in the iris and the structure of the stroma. Melanin is a pigment that gives color to the skin, hair, and eyes. The stroma is the connective tissue that makes up the bulk of the iris.

Eye color can change over time due to a number of factors, including:

* Genetics: Eye color is inherited from our parents, and it is determined by the combination of genes that we receive from them. Some genes make it more likely that a person will have a certain eye color, but there is no one gene that determines eye color.

* Age: Eye color can change as we age. This is because the amount of melanin in the iris can increase over time, which can make the eyes appear darker.

* Sunlight: Exposure to sunlight can also cause the eyes to become darker. This is because ultraviolet (UV) radiation from the sun can stimulate the production of melanin in the iris.

* Injury: An injury to the eye can also change the color of the iris. This is because the injury can damage the stroma, which can cause the eye to appear lighter or darker.

* Certain medical conditions: Some medical conditions, such as albinism, can cause the eyes to appear lighter or darker than they would normally be.

Most eye color changes are gradual and occur over a period of years. However, in some cases, eye color can change suddenly, such as after an injury or in response to certain medical conditions.

If you are concerned about a change in your eye color, it is important to see an eye doctor to rule out any underlying medical conditions.