Oliver Morrison, for 219 Magazine:

[Jay] Neitz, a professor at the University of Washington, tested two squirrel monkeys every day for a year and a half, confirming their colorblindness before experimenting on them.

Then Neitz injected their retinas with a virus that contained the genetic code for the red pigment found in human eyes. The monkeys, called Sam and Dalton—John Dalton was the first scientist to publish a paper on colorblindness in 1798—didn’t show any improvement at first. Five months later, they started passing their color vision tests. Neitz checked the data over and over again. He wanted to demonstrate that the monkeys’ ability to pass the test wasn’t a trick they had learned, but a faculty they had acquired. Finally he opened a bottle of champagne with his wife and lab partner, Maureen.

Gene therapy actually sounds promising. The special glasses, not so much.