Blue light glasses are marketed as a cure for digital eye strain, disturbed sleep and long-term eye damage. The truth is more modest but still useful. Screens emit a small amount of blue-violet light, but the eye strain most people feel after hours of screen work is caused mainly by reduced blinking, poor posture and glare — not blue light itself.
Where a blue-light filtering coating genuinely helps is comfort: it reduces glare from screens and slightly warms the colour temperature of what you see, which many wearers find easier on the eyes during long sessions. Some studies also suggest that blocking blue light in the two to three hours before bed can support melatonin production and sleep quality, particularly for people who work late on laptops or phones.
What a blue light coating will not do is fix an incorrect prescription. If you are getting headaches or blurred vision at your screen, an outdated prescription or uncorrected astigmatism is usually the real cause, and no coating will resolve that.
Our recommendation: if you spend more than five to six hours a day on screens, add a blue-light and anti-glare coating to your regular prescription lenses. Treat it as a comfort upgrade, not a medical necessity, and pair it with the 20-20-20 rule — every 20 minutes, look at something 20 feet away for 20 seconds.