[kazinator]

I experimented working with large fonts when I was in my early 20s. I discovered that it turned out to be bad for the eyes. I believe I understood the issue. I was able to continue to read text fine in spite of not taking any breaks for hours or even not blinking for long periods, letting the eyes dry out. Sure, the text would get blurry, but because the font was so large, that wasn't an impediment.

So while I did confirm the obvious readability of large characters, what you actually want is a small font which is not readable unless your eyes are relaxed and moistened by sufficient blinking.