afghanistan albinism aniridia athena baltic sea black sea carotenoid central asia chromatophore cirrhosis color vision digital object identifier disease epithelium europe eye eye examination gene glaucoma goddess great horned owl greek language greek mythology hepatitis heterochromia human eye human skin color hypopigmentation icelandic india injury intron iran iridology jaundice latanoprost lipochrome lipofuscin list of mendelian traits in humans macular degeneration malaria melanin middle east north america northern europe owl pakistan pigment promoter prostaglandin analogue pteridine purine rayleigh scattering red-eye effect regulatory sequence sclera southern europe tapetum lucidum transillumination uveal melanoma uveitis waardenburg syndrome wikimedia commons x-inactivation