From the famous lines of beloved songs to the stories of ancient legends, eye color has captivated audiences throughout time. The origins and genetic makeup associated with eye color makes the color of one’s eye more complex than a simple collection of aesthetic traits, however. Genes and pigment concentrations are two important factors in determining eye color. Some eye colors are more rare than others and can be linked to genetics or family origins and heritage.
Hannah Scanga, MS, a genetic counselor at the UPMC Eye Center, explains, “The two primary genes that influence the color of the eye, primarily brown and blue eyes, are OCA2 and HERC2. Additional genes influence other eye colors and specific variations, including green or hazel eyes and gold rings.” The scale of eye color from most to least common is brown, blue, hazel, green, and silver.
According to Ellen Mitchell, MD, “Concentrations of the pigment melanin in the iris of the eye is the primary determinant of eye color. Higher amounts of melanin lead to darker colors while lower amounts result in lighter eye colors.” Dr. Mitchell continues, “The pigment lipochrome also plays a role in determining eye color, specifically green eyes.”
Eye color can also change due to factors like pupil size, emotions, and age. However, if these changes are drastic or only occur in one eye this may indicate a medical condition and you should discuss symptoms with a doctor.
Are you still curious about some of the fascinating facts behind blue (green, or brown) eyes? Visit the UPMC Eye Center website to learn more about the latest breakthroughs in the field of optometry and the different eye conditions we treat. Call 1-800-446-3797 to schedule an appointment today.