I seem to be having a terrible time with Youtube wanting to start at wherever in videos, so go to the beginning, if this tries to start in the middle.
As Merphy says, it's not the same for everyone. But when you suddenly realize you have dyslexia, everything changes. Most of the time I'd describe my problem as mild. But, yes, there are moments when I suddenly realize "I can't read this." No one can tell me why. But I know I'm not the only one it happens to.
I usually have worse problems with editing my own writing than correcting someone else's. It's obviously partly because with my own writing I know what I want to be there and *actually see* what I think should be there. I've occasionally misread something someone else has written as Merphy was talking about, but usually I can guess a) the other person is not stupid and b) probably meant something else. So I'll reread things that seem strange over and over, till I'm positive I know what was said.
Incidentally, I'm good at spelling in some ways (did great in spelling bees) but can't spell to save my life when writing especially typing. Same thing for confusing it's/its, their/there/they're, to/too and so on. I *know* the difference. But when I'm typing (sometimes when writing) they're all the same and whatever pops onto the paper/screen is going to seem fine to me. In college and grad school I had to write out my essays by hand, then carefully type what I'd written, correcting as I went along. If I tried to compose at the typewriter it would just come out gibberish. Word processing software makes life so much easier.
Sometimes when I see "(sic)" in a text and want to punch the author in the mouth for being a pretentious jerk. If you are quoting, quote and we'll assume that you and your publisher knew better.