What blue light glasses do
Blue-light filtering lenses cut a portion of the high-energy visible light emitted by screens. The clearest benefit reported by wearers is reduced glare and more comfortable evenings.
What the research says
Evidence that blue light damages the retina at screen levels is thin. What is better supported is sleep hygiene: limiting bright, blue-rich light in the hours before bed helps your circadian rhythm.
Our take
If screens leave your eyes tired, a light filter and an anti-reflective coating are a low-risk, low-cost upgrade. Pair them with the 20-20-20 rule — every 20 minutes, look 20 feet away for 20 seconds.
