Why we're blind to the color blue
I don't believe the blurred images at the end have <i>anything</i> to do with eye focus, as the author suggests.<p>After all, chromatic aberration is blurring of only a very, very small amount.<p>The demonstrated seemingly negligible perceptual effect of blurring blue to a <i>huge</i> degree in a multicolor image doesn't seem to have anything to do with that, but rather the fact that we perceive primary blue as a much <i>darker</i> color than primary red or green, and we perceive differences in lighter colors much more easily.<p>If the author were correct that we have big problems focusing on blue, then we'd see that blue text against a black background would be massively blurry -- but it's simply not. It's comparatively low-contrast (because blue is a dark color), but it's nearly indistinguishably as sharp as red and green.