![]() It is the melanin pigmentation that determines eye color. The stroma between the two layers of the iris contains collagen that reflects light. The reflection causes a cloud in the stroma, which may manifest as a gray, blue, or green iris. If you have gray eyes, the front layer of the iris has less melanin than the back layer, so external light passes through, and the back layer reflects it. ![]() When eyes have a dark iris, it means your eyes have plenty of melanin. The hue of the grey eye may change depending on the mood, surrounding lighting, the weather, medication taken or what you wear. A blue shade of gray is typical in women, while green is common in men. Individuals with varying intensity can have grey eyes, resulting in smoke color, dark grey, almost hazel, bluish-grey, or greenish-grey eyes. It is such a rare occurrence that only about 3 percent of the world’s population has gray eyes. Gray eyes refer to an iris that contains a shade of gray color. Those with grey eyes have little melanin on their irises but a lot of collagen that reflects light and makes the iris look gray. More than eight genes influence the color of the eyes, primarily regulating the quantity and quality of the iris melanin pigment. Women with gray eyes tend to have a blue shade of gray, while men usually have a green shade of gray. The color is caused by the front layer of the iris having less melanin than the back layer. Having gray eyes is one of the rarest physical conditions in the human race.
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