In my case I wouldn't suspect artificial lighting, I had really good eyesight until 10/11yo, when it significandly worsened within months or even weeks, even tho I did not change my reading habits and I did not even have a computer back then and was outside a lot.
On my compulsory checkup 2 years before I could read almost everything except the the smallest line, well, and on the next one I couldn't read even the top letter and even then the GP, going by some methodics, made me try to read all the rest with no success, that was awkward af. It's not like I did not notice, but the change was uneven and I was afraid I gonna get those tard glasses with a patch, so I wanted to delay that moment until it's inevitable. (Didn't get those, thank gods)