Three people with colour blindness now seeing the world through special glasses

This fall, for the first time, Jonathan Mark will be able to appreciate the bright reds, oranges and yellows that appear in the trees before they shed their leaves.
“I’ve never seen the red in the trees,” Mark, 34, said. “There’s a vibrance. You wouldn’t see the vibrancy in that tree, it just wouldn’t be there before.”
Mark, who is colour blind, took people’s word for it when they told him about fall colours. To him, everything looked dark an