What could be really exciting, is that we could develop a way to see other colors. Butterflies see many more colors than Humans and there are rare cases of humans with an extra cone receptor.
I have the standard red/brown color blindness. I have brown eyes and can see well in strong sunlight without squinting. I can navigate unfamiliar landscapes in pure starlight.<p>If I have to give up these traits for better color vision - no thanks. I'm uncertain there is a correlation, but I wouldn't be surprised.
To me "genetically modified" means germline alterations present in the whole organism. Here I'd suggest "somatically modified", denoting only changes in some somatic cells.