What Is Blue Light?
Blue light is the portion of the visible light spectrum with wavelengths between approximately 380–500 nm. It is present in sunlight (where it helps regulate our circadian rhythm), LED screens, and fluorescent lighting.
What the Research Actually Says
The honest summary: the evidence for blue light glasses reducing eye strain is weak. Multiple clinical reviews, including a 2021 Cochrane Review, found no significant reduction in digital eye strain symptoms from blue-light-blocking lenses compared to regular clear lenses. However, the research on sleep disruption is more nuanced — blue light exposure before bed may suppress melatonin production.
What Actually Causes Digital Eye Strain
Digital eye strain is real, but its primary causes are not blue light. The real culprits are: reduced blink rate (40–60% less than normal when focusing on screens), constant near-focus fatigue, poor ergonomics, and uncorrected refractive error.
What Genuinely Helps
- The 20-20-20 rule: Every 20 minutes, look at something 20 feet away for 20 seconds.
- Anti-reflective coating: Reduces glare from screens — this is proven and effective.
- Correct prescription: Get your eyes tested if you have not done so recently.
- Artificial tears: If dryness is an issue, lubricating eye drops help more than any lens coating.