Eye strain on iPad vs e-ink

Hi all, I’m curious if anyone else finds they experience more eye strain using an e-ink reader like a kindle or kobo compared to an iPad (especially more recent models). I’ve read on an iPad Pro for the last few years mainly, but I’ve been trying out a kobo libra for the past few days to see if I notice a difference in long reading sessions. What I’ve found is, if anything, the e-ink reader causes more eye strain than the iPad. I’ve always heard e-ink touted as much better for your eyes, but as far as I can tell this hasn’t really been the case for me. Curious about others’ experiences. Thanks!