Asus ZenBook 14 UX425EA-EH71 E-Manual page 54

Level 1-5: The higher the level, the more blue light emission
is reduced. Level 5 is the optimized setting. When Eye Care
Mode is activated, the default settings of Normal Mode will be
automatically imported. It is compliant with TÜV Low Blue Light
Certification.
54 Notebook PC E-Manual