More than color blindness cured, gene therapy can add new colors.

Using a CRISPR like technique a virus implanted genes to add colors to the eye - red and green in this case. ADDING COLORS TO YOUR EYE USING BIOLOGY! It already happened - not just theory.

You can not only correct colorblindness. But, you can add new colors like infrared, etc. Nature has many other examples of light sensitive molecules (cones & rods, etc) that we can borrow from. Our brain is a pattern recognition machine, it can take almost any signal and develop meaning from the noise. Good TED Talk on that here: http://www.ted.com/talks/david_eagleman_can_we_create_new_senses_for_humans?language=en

"The virus contained genes for red pigment in cone cells—cells in the eye that respond to light and color. The virus inserted the red-pigment genes into some of the monkey's green-sensitive cone cells, causing those cells to become red sensitive.

Within about 20 weeks, the two monkeys were able to point out red and green, according to the study, to be published tomorrow in the journal Nature.

To formerly color-blind monkeys, the change confers profound abilities, noted visual neurobiologist and color-vision expert Bevil Conway—for example, the ability to find fruit amid green leaves."

“Biology in 2013 feels like computing in 1975 (just before the PC): ripe for an explosion.” – Mike Loukides, Editor of "BioCoder"

http://news.nationalgeographic.com/news/2009/09/090916-color-blind-gene-monkeys_2.html