From iconic historical figures to Hollywood stars - blue eyes have always been 'in'. Yet, few will have guessed they ...
“Higher melanin levels lead to darker pupils. Lower melanin levels lead to light or blue eyes.” Of course, not all blue eyes ...
The animal's eyes change from a golden colour to a deep blue as summer fades to winter, helping it to see in dramatically different light levels. The part that changes colour is called the tapetum ...