A recent Cochrane review of 17 studies found no conclusive evidence that blue light filter glasses improve vision, sleep, or reduce eye strain. The review, conducted by researchers from universities in Australia and the UK, challenges the widespread marketing claims surrounding these glasses.
Researchers compared participants wearing blue light filter glasses to those wearing regular glasses. Study sizes varied significantly, and the follow-up periods ranged from one day to five weeks. The analysis showed insufficient evidence to support the purported benefits.
Experts, including ophthalmologists from Brazil and the US, concur with the review's findings. They emphasize that the amount of blue light from screens is minimal compared to natural daylight and that any potential benefits of blue light filtering would necessitate overly dark lenses, impacting vision. Eye fatigue, they explain, is primarily related to blinking habits and screen usage patterns.
The review also examined the efficacy of 'night mode' settings on devices. A separate study found no significant difference in sleep quality between those using night mode and those who did not, with better sleep quality observed among participants who refrained from using mobile devices before bed.
The American Academy of Ophthalmology's recommendations for reducing screen-related eye strain include taking frequent breaks, using artificial tears, maintaining a proper viewing distance, reducing screen brightness, and using regular glasses instead of specialized lenses.
The review acknowledges limitations, including the short follow-up periods in the studies examined, hindering conclusive long-term impact assessment. Further high-quality, long-term studies are needed to draw definitive conclusions.