ELI5 Colorblindness - can special glasses really fix it?

Why are men so much more likely to be colorblind? How do colourblind people know they’re colourblind? How are colourblind people able to recognize the colors when they put on those special glasses, when they have never seen those colors before? Do 3D glasses still work if you are colorblind?   ... We explain like i'm five!   Thank you to the r/explainlikeimfive community as always and in particular the following users whose questions and comments formed the basis of this discussion: idk_what_a_name_is, mandydax, nathanwick, tiny_hay, mejasper, deustaurus, un0m, batmanssidepunch & imbadatreddit69 To the ELI5 community that has supported us so far, thanks for all your feedback and comments. Send us an e-mail: [email protected]