Tip: hold the mouse button/spacebar to skip text quickly :) you can also go into the settings and select 'chapter' to skip some chapters.
But yeah, core VN reading options are missing, I know. It's not native to the engine I'm using, but I'm on the lookout for those options in the future, maybe someone will make something similar.
You're the second person to mention the eyes. I think I know what's causing the bug, hopefully I can find a better solution than what I'm currently using.