What makes eyes dark brown?
The same pigment that makes eyes appear dark brown also makes them green, hazel or blue when distributed in different levels.The IrisThe BBC describes the iris as a muscle that allows light into the eye. It consists of an anterior level, followed by a collagen-based stroma level and two endothelium layers.MelaninMelanin, the pigment that accounts for skin, hair and eye color, occurs in varying levels in humans, creating brown or other colors based on the pigment density.Brown EyesBrown-eyed people have a large quantity of melanin in the anterior layer of the iris. The melanin absorbs incoming light, giving the iris a dark-brown appearance. The thicker the melanin distribution, the darker the iris appears.Melanin VariationsWhen the anterior iris contains little melanin, most of the incoming light passes through to the stroma, which then scatters the light to give the iris a blue appearance. Green or hazel eyes contain an intermediate level of melanin.Hereditary FactorsPeople inherit the
