Blue-light filtering glasses may not reduce eyestrain linked with computer use. Their effect on sleep quality and eye health is also unclear, researchers say.
promote the glasses’ potential to consumers. Warby Parker’s website states that “if screen time is affecting your sleep, blue-light-filtering lenses may help.” Felix Gray says on its webpage that wearing blue-light blocking glasses can reduce conditions such as eye fatigue, dry eyes and eyestrain. Neither company responded to email requests for comment.
Bright light, especially short-wavelength light, from devices, for instance, at night can confuse the biological clock and may make it hard to go to sleep or stay asleep. Downie added that the patients in the studies had sleep or mood disorders. “They weren’t evaluating interventions in the general population,” she said. “So we can’t make any statement around the potential utility in relation to sleep in general, healthy adults.”The review also found “little or no effect” with blue-light filtering lenses on visual performance and daytime alertness.
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