When I went to check my sight after repeatedly getting blurry vision/eye strain after working (mostly reading on laptop) they said they couldn't find any issue

When I went to check my sight after repeatedly getting blurry vision/eye strain after working (mostly reading on laptop) they said they couldn't find any issue with my sight. One of the eye were a bit worse than the other, with trouble with distant object, but not to the level of needing glasses. But I insisted and made (very weak) glasses with blue-light filter included, and these days I use it when I need to read stuff on the screen (I get zero strain or blurry vision when I play games, in same setup, oddly enough). It helps a lot but they're not perfect, sometimes I still get blurry vision after a while. Later on I experimented with lightning condition, and realized that my eyestrain often correlated with bad lightning (cafe, when remote work) and stress/bad sleep. Better lightning also help, but not perfectly. It's also odd because since childhood I've been sensitive to light. Walking outdoors in the summer, I can't keep my eyes fully open.