Short answer
Not for eye strain, as far as trials show. A 2023 Cochrane review of 17 randomized trials with 619 people found no short-term eye-strain benefit over clear lenses and little or no effect on eyesight. Sleep results were mixed and very uncertain. The American Academy of Ophthalmology suggests the free 20-20-20 rule instead.
What the trials found
A 2023 Cochrane review pooled 17 randomized trials with 619 people in six countries, comparing blue-light filtering lenses with ordinary clear lenses. For eye strain from screens, there may be no short-term benefit (low-certainty evidence). For eyesight, there is probably little or no effect (moderate certainty).
Sleep and long-term eye health
Sleep results were mixed: three trials found an improvement and three found no difference, and the certainty is very low. No included trial looked at long-term eye health such as the macula, so there is no answer either way.
What actually helps
The American Academy of Ophthalmology advises skipping glasses sold to protect your eyes from blue light, citing a lack of evidence. Its suggestion is free: every 20 minutes, look at something at least 20 feet away for at least 20 seconds. For sleep, it suggests limiting screens in the two to three hours before bed and using night settings.
Decoded / the concept
Certainty of evidence
How sure scientists are, not just what they found.
Reviews grade each result high, moderate, low or very low. Low means the real effect could be quite different from what the trials show.
What you can do
- Try 20-20-20 during your next screen session.
- Ease off screens two to three hours before bed.
- Save your money unless you simply like the lenses.
Common questions
Do blue-light glasses help with eye strain?
Probably not in the short term. A 2023 Cochrane review of 17 trials found no clear benefit over ordinary clear lenses.
What do eye doctors recommend instead?
The American Academy of Ophthalmology suggests the 20-20-20 rule: every 20 minutes, look at something 20 feet away for 20 seconds.
Published 2026-09-30 · Last reviewed 2026-09-30
Educational content, not medical advice. Talk to your clinician before changing anything about your health.
