Neither blue nor green pigments are ever present in the human iris or ocular fluid. The genetics of eye color are complicated, and color is determined by multiple genes. So far, as many as 15 genes have been associated color me beautiful pdf eye color inheritance.
The genetics of eye color are so complex that almost any parent-child combination of eye colors can occur. These genes are sought using associations to small changes in the genes themselves and in neighboring genes. The actual number of genes that contribute to eye color is currently unknown, but there are a few likely candidates. The name of the gene is derived from the disorder it causes, oculocutaneous albinism type II.