> maybe in 100M years we'll get a 4th cone or rod. Probably from nuclear mutation... There’s a Greg Egan short story (I think it’s ‘Seventh Sight’) where a bun

> maybe in 100M years we'll get a 4th cone or rod. Probably from nuclear mutation... There’s a Greg Egan short story (I think it’s ‘Seventh Sight’) where a bunch of formerly blind kids with cybernetic eyes hack the receptors to respond to wavelengths other than the traditional RGB. So perhaps it wont take millions of years.