“Let’s be clear from the start: color contrast will concerns every one of us as some point. Who has never used her iPhone in the plain sun and complained that she could not read anything? Who has not dreamt of working on the terrace of a café only to find out that they could not see anything on the screen? You get the point: everybody struggles at some point with problems due to lack of contrast, color blind or not.”
http://www.inpixelitrust.fr/blog/en/tips-create-accessible-color-palette/