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Old 06-28-2010, 11:11 AM
Napier Napier is offline
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Join Date: Jan 2001
Location: Mid Atlantic, USA
Posts: 9,115
As one of the resident physicists (though not one of the best ones) I offer two points:

1) Blue focuses differently, though this isn't such a problem unless you are trying to focus red and blue together. A point source of purple light illustrates this nicely - your eye generally focuses to make the red sharp and leaves the blue as a haze around it. But if it's isolated blue things against a dark background this isn't so important.

2) Much more significant to the OP, you don't have the retinal ability to resolve blue very well. It isn't the sensitivity, it's the density of blue receptors or how they are wired. This makes blue text on a black background hard to read, and yellow text on a white background hard to read (in these two cases it's only in the blue that letters and background differ).