An American Journal of Ophthalmology study of 3,654 Australians with dark- and light ... with a deep understanding of eyes ...

dark hair and blue eyes.) The genetic basis for lighter skin seems to have emerged in Sweden at about the same time as lighter eyes, but initially it remained relatively rare, Ghirotto said.

The animal's eyes change from a golden colour to a deep blue as summer fades to winter ... It is a shiny, mirrored layer behind the retina that helps some animals to see in the dark. When light enters ...