I had an interesting talk with a local newspaper journalist about the advent of new media and its implications on society. She mentioned that she has progrssive lenses, where the top of her lens is for seeing far, the middle of the lens is for mid-distance looking, and the bottom of her lens is for reading.
She mentioned that, for reading things online, she required mid-distance lenses, but because the style of glasses a few years ago were too thin from top to bottom, this would cause problems with her reading of a computer screen. She claims that it is better with the wider (or taller) styles of glasses now. There is more room for that mid-range section in the middle of the progressive lens.
This just might be a case of new media (newspapers online, for instance) beginning to dictate style.
Or not. But it is something very interesting that I never ever thought about.