where brown eyes lighten to a hazel shade, "usually doesn't happen." A stock image of a close-up of a woman's eye. "Eye color is complex and is controlled by 16 different genes," Dr. Rupa Wong ...

Mark Ruffalo already has Hulked out in Avengers, but it took us staring at new Avengers: Age of Ultron stills to notice that his green guy doesn't have green eyes. Look, they're hazel ...

"One eye was just a little bit weaker. So just to kind of strengthen it, we covered the other one up a little bit a day," Danielle Busby says of her 5-year-old daughter OutDaughtered's Hazel Busby ...