Blue light is the high-energy part of the visible spectrum, emitted by screens — but the largest source of blue light is not screens, it is the sun. This is the first fact to keep in mind.
The effects of visible light on skin remain an area of ongoing research. Some studies suggest intense, prolonged exposure may affect skin appearance, while the blue light from everyday screen use is quite low compared with sun exposure.
The practical conclusion: approach exaggerated marketing claims with caution. The most effective steps remain the same — regular sun protection, barrier-friendly care and antioxidant-supported formulas. A separate "special product" for screen use is unnecessary for most people.