However, most studies have shown that dark characters on a light background are superior to light characters on a dark background (when the refresh rate is fairly high). For example, Bauer and Cavonius (1980) found that participants were 26% more accurate in reading text when they read it with dark characters on a light background.
Reference: Bauer, D., & Cavonius, C., R. (1980). Improving the legibility of visual display units through contrast reversal. In E. Grandjean, E. Vigliani (Eds.), Ergonomic Aspects of Visual Display Terminals (pp. 137-142). London: Taylor & Francis
People with astigmatism (aproximately 50% of the population) find it harder to read white text on black than black text on white. Part of this has to do with light levels:
with a bright display (white background) the iris closes a bit more, decreasing the effect of the “deformed” lens; with a dark display (black background) the iris opens to receive more light and the deformation of the lens creates a much fuzzier focus at the eye.
but you can choose mostly between dark or light theme on most webs, and the problem with greys is that what is enough grey for you, may not be enough grey for me
so in the end, you can fail with black background, While I would like to mention is that I prefer a clear grey over black background than white over black
Hence, I said: placebo effect.
Studies had consistently showed that Positive Polarity (Black on white) are much better than Negative Polarity (White on Black).
You hate light, since people with astigmatism tend to have heavy glare when they saw strong light, hence why you unconsciously avoid any strong light.
That's study wasn't made on me, I read a lot while I';m sleepy in bed, and sometimes I just stop reading and doze off for a few minutes and then if I can't sleep, I said oh well, let's keep reading, but my eyes are super sensitive to the whites on the screen..
That's why you feel the screen glare as heavy...
Try this: Use a penlight or a torch. Shine yourself in a well-lit room and in a dark room. The penlight or torch will be felt brighter in the dark room than in a well-lit room.
In the absence of ambient light, our eye became really sensitive to any light.
@Black Heart Nope. Dark on Grey. Dark on White could cause 'Halation' which is when the text 'bleed' on the background making the letters seems blurry. If screen light glare (due to low ambient light) bothers you. Use Grey on black, less halation, but it will strain your brain more (our brain is great at looking shadows in light, sadly not the reverse)
@Black Heart is not recommended to do anything on a pc in a dark room since it's bad for the eyes the fact than just the small area of the screen you are concentrating on is full of light while the rest of your surroundings are dark, but most people me included just keep doing the things the bad way..
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