Blue‑light filtering spectacle lenses for visual performance, sleep, and macular health in adults (Cochrane Review)

Summary

This Cochrane review looked at 17 clinical trials that tested whether blue-light filtering glasses improve eye comfort, sleep, or protect eye health. The studies included over 600 adults and followed them for periods ranging from less than a day to five weeks. Results showed little to no short-term benefit for reducing digital eye strain or improving vision compared with regular lenses. The effect on sleep was uncertain, with some trials reporting small improvements and others showing no difference. Importantly, none of the studies provided evidence on whether these glasses protect the back of the eye (macula) or improve long-term eye health. Reported side effects were rare and mild, such as headaches or discomfort wearing the glasses. Overall, the evidence suggests that blue-light glasses are safe but offer limited short-term benefits, and more high-quality research is needed to know their long-term effects.