[Washuu]

It could have a minor bit to do with relative age of the designers, but I would assume it is more do with current designer trends. Personally, I do not wear glasses and have considerably good vision as well I even go to the extent of using good monitors with IPS panels that are properly calibrated. Even then there are issues with font contrast in OS 10.9 and iOS 7 where they decide to use a white font with a very light drop shadow.

I have always made sure to design with disabilities in mind.(Section 508 government work.) There was a previous designer I worked with a couple years ago that came from the Silicon Valley area that would require a weekly reminder that low contrast designs would not be acceptable.