Green is the rarest eye color of the most common colors. With a few exceptions, almost everyone has brown, blue, green eyes, or somewhere in between. Other colors such as gray or hazel are less common. About 10,000 years ago, everyone in the world had brown eyes. Scientists believe that the first person with blue eyes had a genetic mutation that caused the body to produce less melanin.
Today, about half of people in the United States have brown eyes. At first, we all had brown eyes. However, a genetic mutation that affected the OCA2 gene in our chromosomes caused the creation of a “switch”, which literally “disabled” the ability to produce brown eyes. Of those four, green is the rarest. It occurs in approximately 9% of Americans, but only in 2% of the world's population.
Blue is the second most common and brown tops the list with 45% of the U. S. population. Department of State and possibly nearly 80% worldwide. Every eye color does, even green is actually a shade of brown, thanks to the melanin inside the iris.
Like blue eyes, gray eyes have a dark epithelium on the back of the iris and a relatively clear stroma on the front. So how is the hare turquoise and how strange is it that my eyes change color like that? I was born in Cavan, Ireland, and my father is from Dublin. People with brown eyes are less likely to have macular degeneration, eye cancer, or diabetes-related retinopathy. Heterochromia (heterochromia iridium or heterochromia iridis) is an eye condition in which one iris is a different color from the other (complete heterochromia) or in which part of an iris is a different color from the rest (partial heterochromia or sectoral heterochromia). Many people will argue that their eye color is purely genetic, which is true for the most part.
People with black eyes, on the other hand, have very dark brown eyes that are almost indistinguishable from the pupil. The Newborn Eye Screening Test (NEST) found that 63% of babies were born with brown eyes, while only 21% were born with blue eyes. Although there is a lack of research, many sources claim that the rarest combination is blue eyes with red hair. In addition, hazel eyes may appear to change color and consist of specks and ripples, while amber eyes are a solid shade of gold. Changes (lightening or darkening) in eye color during early childhood, puberty, pregnancy, and sometimes after serious trauma (such as heterochromia) represent the cause of a plausible argument that some eyes may or may change, depending on chemical reactions and hormonal changes within the body.
I think I have central heterochromic eyes and the center is brown and the outside is sometimes green, but other times it's gray and it can also be green-gray, blue-green or blue-gray. In severe forms of albinism, there is no pigment in the back of the iris and light from inside the eye can pass through the iris to the front. I have blue eyes with small amounts of brown color that darken or lighten due to the mood, for example, if they are angry or depressed, they darken, but if they are happy or relaxed, they turn very light blue.