"My eyes are happiest when"...it really depends...<p>To use an extreme example, back when I was experiencing corneal erosions (you don't want those), contrast itself was the enemy. You send me this website, I am going to have to play with my display settings and also probably put on sunglasses.<p>Thinking of more common contextual preference change, time of day comes to mind.<p>I wish my e-reader clients could pick up on my time-of-day settings changes, because sometimes I want contrast and white on black, just dimmed in general, and at other times I want sepia but brighter...but generally there are obvious rules that could be derived based on what time it is.<p>(Sending people to websites like this without caging it in some kind of wink or chuckle of an expression seems like it would be a bit over the top...)
I totally disagree. My eyes ache after looking at white backgrounds too much. That's what dark styles are for. They're much more relaxing for me. I will never read a whole bunch of text if it's got a white background. It just plain hurts. In fact, I use a plugin that converts every page to a dark style. If there's a page that doesn't render well that way (rarely) and I really want to read it, I'll squint and read it quickly before I get some sweet relief by switching back to dark mode.
> The eyes are happiest reading dark text on a light background<p>Hi, dark mode-everything user here. I <i>highly</i> disagree. I don't have vision problems per se, but white everything at all times causes strain.<p>Also, comparing black vs light and vice versa for text reading is a bad example, but the author points it out by mentioning the changing of color schemes.<p>Edit: As a point, I'm using a moderate red color shift on my monitor on top of dark themes. It's far, far better for my eyesight than proverbially staring into the sun!