I think this is something people commonly conflate. These two things are true: 1. screens cause eye strain, 2. screens make it harder to sleep because of blue

I think this is something people commonly conflate. These two things are true: 1. screens cause eye strain, 2. screens make it harder to sleep because of blue light. People then mistakenly interpret this as "screens cause eye strain because of blue light". It's a bit frustrating how many blue light filters advertise themselves as reducing eye strain, exploiting this misconception.