Blue light lenses are one of the most heavily marketed products in eyewear, and also one of the most misunderstood. Here's what blue light actually is, what current research does and doesn't support, and when we'd genuinely recommend one.
Visible light is made up of a spectrum of wavelengths, and blue light sits at the shorter, higher-energy end of that spectrum, roughly 400 to 500 nanometres. It's part of ordinary daylight, and it's what gives a clear sky its colour. It also plays a genuine biological role: blue light exposure during the day helps regulate your circadian rhythm, the internal clock that governs alertness and sleep.
Screens, phones, tablets and LED lighting all emit some blue light, but considerably less than the sun does. Sitting outdoors on an overcast day exposes your eyes to more blue light than several hours in front of a monitor.
We'd rather explain this properly than sell you a lens with promises it may not keep.
Blue-light filtering lenses do reduce the amount of blue light reaching your eyes, that part is measurable. What's far less certain is whether that filtering meaningfully reduces digital eye strain. Current systematic reviews of the available clinical trials have generally found the evidence low-certainty and inconsistent, meaning we can't confidently say blue-light lenses reduce eye strain more than an ordinary lens does.
That doesn't mean blue-light lenses are pointless, only that they shouldn't be sold as a proven fix for tired eyes. If you'd like the added filtering, we're glad to include it. We just won't tell you it will solve a problem the research hasn't confirmed it solves.
Concentrating on a screen lowers how often you blink, drying the eye's surface. This is one of the better-supported causes of digital eye strain.
Even a small, outdated prescription forces the eye to work harder to focus on screen text, and is a common, fixable cause of strain.
Screen glare and lens-surface reflections make text harder to resolve. An anti-reflective coating has clearer evidence of improving comfort here.
Long, uninterrupted close-up focusing fatigues the eye's focusing muscles, regardless of the light involved.
The more established concern with blue light isn't eye damage, it's timing. Blue light exposure in the evening can suppress melatonin release and delay your body's signal that it's time to sleep. This is a real, well-studied effect, and it applies more to when you're exposed to screens than how bright or sharp your eyes feel the next day.
If evening screen use is disrupting your sleep, reducing screen brightness, using a warmer colour setting, or simply stepping away from devices an hour before bed tends to help more than a blue-light lens coating alone.
If you'd like a blue-light filtering option, it's available across each of our partner lens brands, usually as a lens material or a coating layer.
A clear lens material that filters violet and a portion of blue-violet light at the point of manufacture, rather than as a surface coating.
Explore Hoya lenses →A lens designed for everyday screen use, paired with an anti-reflective coating that also filters a portion of blue-violet light.
Explore Essilor lenses →An anti-reflective coating option that reduces reflected blue light from the lens surface alongside standard glare protection.
Explore Zeiss lenses →Ultra-thin Japanese lens options with violet and UV400 filtering built into select materials, alongside their signature high-index designs.
Explore Tokai lenses →
Bring your screen habits and any symptoms you've noticed to your next eye test, and we'll help you work out whether a blue-light option, an updated prescription, or a change in habits will help most.