However, two parents with brown eyes can have children with blue eyes. Curiosities About The Human Eyesįor many years, geneticists have believed that a single gene determines the color of a person's eyes, with brown eyes dominating blue eyes. The easiest to notice is the pigmented ring that surrounds the pupil. When we examine our eyes, we notice several patterns. The physical topography of the iris plays a very important role. This causes the unique colors we see as green and grey.īut it's not just color that makes our eyes unique. These fibers propagate light and so the iris looks blue.Įye colors that fall between the dark brown and light blue ranges have varying amounts of pigment as well as areas without pigment. So how come they are blue? Because of the white collagen fibers in the connective tissue in the iris. However, there is no blue pigment in our eyes. Light blue eyes are more common in people from Europe. The pigment cells of the iris, called melanocytes, produce two different types of pigment: eumelanin - brown or black, and pheomelanin - red or yellow.Įye color is determined by the pattern of brown and red pigment, collagen fibers, and the topography of the iris.īlack or almost black eyes are the most pigmented, and light blue eyes have the least amount of pigment. The color of the eyes depends on the amount of pigment and connective tissue. The iris is 12 millimeters in diameter and is made up of connective tissue and a thin muscle that allows it to open according to the light. What is the secret behind each eye color? Eyes come in many shades from dark brown almost black, to light brown and from green to grey and blue.ĭespite the many variations we perceive, there are only two different pigments in our eyes: brown and red. What determines eye color? Brown, blue, green. Some believe that the eyes reveal a person's personality, others that it is an indicator of health. Since ancient times, people have been interested in the mystery of eye colors.
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