A couple of studies on reception. First, there’s now vision data to back up the idea that everything looks kind of grey when you feel blur. Researchers examined how the retina responding to different black-and-white contrast situations. They did the tests on healthy subjects and on patients with depression. Turns out that depressed people have much lower retinal responses -- even if they’re on antidepressants. And the worse the depression, the worse the perfection of the retina.