12-29-2008, 03:21 PM
Blue light doesn't get focused as well as red/yellow/green light, even if your vision is perfectly corrected. This usually isn't a big deal, though, because most "blue" signs (at least the ones I see) are actually WHITE on blue, and the colors that provide the contrast -- red and green, which are present in the white stuff, but absent in the blue stuff -- are focused clearly.
Misguided designers who put a blue backlight on a display, or use blue light for general illumination, are Doing It Wrong. Black-on-blue or blue-on-black is much harder to read than almost any other black-and-color combination.
You mention "scrolling" blue signs, which makes me think that you're talking about blue letters on a black background. Yes, that's going to be hard to read. If you're having trouble with white letters on a blue background, there might be something else going on.
Misguided designers who put a blue backlight on a display, or use blue light for general illumination, are Doing It Wrong. Black-on-blue or blue-on-black is much harder to read than almost any other black-and-color combination.
You mention "scrolling" blue signs, which makes me think that you're talking about blue letters on a black background. Yes, that's going to be hard to read. If you're having trouble with white letters on a blue background, there might be something else going on.