Sadly, after 2-3 hours of viewing, my eyes get very tired, if I continue watching, then my head starts to hurt. Previously, I did not see this on my other TVs (before that, the main TV was Sony KD-55X9005). This is probably a feature of OLED technology, although I look at 80-90% brightness and PWM should not have such an effect. Maybe it's just old age creeping up :)
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