Blue light affects your circadian rhythm, use blue blocker glasses, use F.lux. Adjust phone and device brightness to be the minimal amount you're comfortable reading. Don't use full screen brightness at night, especially because your pupils are more dilated in lower light environments. Use dark mode everywhere you can.
Blue LED light may be toxic to your retina with long term exposure. The jury is still out on this one, but the above steps will help mitigate the issue.
The other issue is emmetropization and nearsightedness. Incredibly important to understand for children. It will affect you too if your eye prescription continues to change. It usually stops in your 20s (your vision stops getting worse), but for some it continues to degrade past that. Holding things close to your face keeps your peripheral vision in focus, making your eye think it's over-focusing, so the eye grows longer (more near sighted) to try to correct. This happens without the brain's involvement, it's all based on focus on the retina. Your eye doctor should know about this process, should know about low dose atropine, and should know about glasses with fogged edges, especially for children. Most don't.