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  PWM Dimming Explained – Why Your Eyes Might Be Hurting Not all brightness controls are created equal. PWM (Pulse Width Modulation) dimming rapidly flickers the screen backlight—something many users can't see, but definitely feel. This can cause eye strain, fatigue, and even headaches, especially at lower brightness levels. If you’re sensitive to flicker, you may want to consider a PWM-free or flicker-safe screen. At Bliss Computers, we can help match you with a better …