Do Blue Light Glasses Work? What the Research Says

In short: the best study on this topic, a 2023 Cochrane review, found no evidence that blue light filtering glasses reduce eye strain from computer work. The American Academy of Ophthalmology also does not recommend them for screen work and says screen blue light does not damage the eyes. What really helps is breaks, blinking, good lighting and screen settings.

What is blue light and where does the fear come from?

Blue light is part of the visible spectrum with a short wavelength, emitted by the sun, screens and lamps. The sun provides far more than a monitor. The fear arose from the assumption that screens might damage the retina or disturb sleep. For vision these assumptions have not been confirmed; for sleep the question is more complicated (see below).

What the research says

Cochrane review (2023). The review combined 17 studies involving 619 people. Conclusion: blue light filtering glasses probably do not reduce short-term eye strain from computer work compared with ordinary lenses. There is too little data on retinal protection and sleep to draw conclusions. Side effects were mild and also occurred with ordinary lenses. Cochrane review.

American Academy of Ophthalmology. Position: there is no scientific evidence that blue light from digital devices damages the eyes, and the symptoms of "digital eye strain" are linked to how screens are used, not to blue light. The Academy does not recommend special glasses for computer use. AAO article.

So why do eyes tire from a screen?

The causes are more real than blue light:

• We blink less. Blink rate drops roughly by half at a screen and the eye dries: dry eyes from screens.
• We look up close for long. Constant focusing strains the eye muscles.
• Glare and contrast. A bright screen in a dark room or glare from a window.
• Wrong distance and posture. See monitor height and distance.
• Uncorrected vision. Mild farsightedness or astigmatism without glasses.

What actually helps

1. The 20-20-20 rule. Every 20 minutes look at something 6 metres (20 feet) away for at least 20 seconds.
2. Blink consciously and use lubricating drops on a doctor's advice if needed.
3. Brightness and lighting. Screen brightness should match the room lighting, see monitor brightness.
4. Screen distance about an arm's length, top of the screen at eye level or slightly below.
5. Have your vision checked by an ophthalmologist or optometrist: sometimes ordinary correction helps.
6. Breaks. Even a short stretch of the neck, shoulders and eyes.

Is there any point in tinted lenses and filters?

If you are more comfortable in glasses with yellowish lenses you can wear them. Some people report subjective relief, for example from glare. But do not expect a proven therapeutic effect. For lens colour differences read yellow, clear and red lenses compared.

What about sleep?

Bright light in the evening, including from a screen, can shift the body clock. The American Academy of Sleep Medicine advises turning off electronic devices 30–60 minutes before bed. That is simpler and more reliable than glasses. More: late gaming and sleep. AASM article.

When to see a doctor

If your eyes hurt, redden, vision blurs, headaches appear, or symptoms do not go away after rest and changes to your work routine, make an appointment with an ophthalmologist.