What Ophthalmologists Actually Say About Blue Light Glasses

Blue light glasses are sold as protection for eyes that spend all day on screens. Eye doctors' groups are clear: the evidence doesn't support them for eye strain or eye health. Here's what they say, and what actually helps.

What the experts say

• The American Academy of Ophthalmology doesn't recommend blue light glasses. It says the amount of blue light from screens doesn't damage the eyes.
• A 2023 Cochrane review of the available studies found that blue-light filtering lenses probably make little or no difference to eye strain from computer use in the short term, and found no good evidence about long-term eye health.
• The sun is a far bigger source of blue light than any screen.

So why do screens tire your eyes?

• Focusing up close for hours without breaks.
• Blinking less, which dries the eyes.
• Glare and screens too bright or dim for the room.
• Screens too close or at the wrong height.
• Uncorrected or outdated prescriptions.

See computer vision syndrome explained.

What about sleep?

Light in the evening, especially bright, blue-rich light, can delay the body's sleep signals. That's a separate question from eye strain. The simplest steps are dimming screens, warming their colors and stopping screen use a while before bed. Evidence for blue light glasses improving sleep is mixed.

What eye doctors recommend instead

1. Take regular breaks and look into the distance. See the 20-20-20 rule.
2. Use lubricating eye drops if your eyes feel dry.
3. Keep the screen about an arm's length away, slightly below eye level.
4. Match screen brightness to the room and remove glare.
5. Get an eye exam, and ask about glasses for screen distance if you need them.

Are they harmful?

No, they're generally safe. If you like how they feel, there's no harm in wearing them; just don't rely on them instead of breaks and a proper eye exam. Strongly tinted lenses can distort colors, which matters for design and photo work.

Warm screens, if you like them

Night Light on Windows and Night Shift on Mac warm the whole screen in the evening. Blue Light Filter does the same for web pages in Chrome on a schedule. Like glasses, these are about comfort and evening habits, not protecting your eyes from damage. See Night Shift vs a filter extension.