andc My eyes get tired alot now. Never had that issue before I started using macs though. El Capitan has no issues, I have a macbook pro at home running on it and it literally gives me no issues.
The issue is with my work given Mac, which has HS on it, and I cant go back in versions. This mac with the OS has become unusable, so I plan to return it the company and get a Win10 machine.
No problems on Win10 on any PC. I dont think PWM is the issue. I believe something changed between OSs and my eyes are sensitive to it.