What are Blue Light Glasses?

What Are Blue Light Glasses?

New Zealand has a reputation for fresh air and the outdoor life, bush tracks on the weekend, time on the water, long summer evenings. But most weekdays look pretty different. LED lighting, laptop screens, phones, streaming. Nine hours on screens isn't unusual anymore. For a lot of people it's just Tuesday.

If you're dragging yourself through the afternoon, waking up foggy, or lying in bed at night with your brain still running, there's a reasonable chance your circadian rhythm is being disrupted. Blue light glasses are designed to help with exactly that, they use specialised lens filters to block the high-energy blue light emitted by your devices before it reaches your eyes.

Your Internal Body Clock

Deep inside your brain sits a tiny cluster of cells called the suprachiasmatic nucleus. Doesn't sound like much, but it runs the show. These cells control your circadian rhythms, the internal schedule that governs your sleep, digestion, body temperature, alertness and hormone release.

Two hormones do most of the work. Cortisol rises in the morning, sharpening focus and raising blood pressure, what's known as the cortisol awakening response. Melatonin takes over in the evening, lowering your body temperature and preparing you for sleep and recovery.

When blue light disrupts that pattern, cortisol can stay elevated when it shouldn't and melatonin gets delayed. The result is a frustrating paradox that a lot of people recognise, exhausted all day, wide awake at midnight.

Morning Sunlight

Most of us know the routine. Alarm goes off, phone lights up, and before you've even sat up you're scrolling through emails and notifications. It feels productive but it's not doing your body clock any favours.

Digital blue light is actually quite faint compared to natural sunlight, nowhere near enough intensity to properly signal your brain that the day has started. Neuroscientist Professor Andrew Huberman from Stanford University has done extensive research on this. His work shows that around 20 minutes of natural sunlight within the first hour of waking activates specialised retinal cells that synchronise your circadian rhythm. When those cells detect sunlight, melatonin stops and cortisol starts rising, setting up a timer that will naturally increase melatonin again later in the evening.

The catch is that it needs to be actual outdoor light, not through a window. Even on an overcast Wellington morning, outdoor light can be ten times stronger than indoor lighting, more than enough to trigger the reset.

Lock In Your Morning Signal

Getting outside within the first 30 minutes after waking and letting natural light hit your eyes for 10 minutes or more makes a genuine difference. You don't need to stare at the sky, just be outside, without sunglasses, letting the light in. That early exposure tells your brain the day has officially begun, triggers the cortisol rise, and starts the internal countdown that brings melatonin back in the evening.

It's also worth delaying your morning coffee. In the first hour or two after waking, your body is still clearing residual melatonin naturally. Caffeine at that point can interrupt that process and set you up for an energy crash later in the afternoon. Huberman recommends waiting roughly 90 minutes to two hours before your first coffee, letting your body do its own work first. Combined with consistent sleep times and reduced screen use in the evening, the difference in daytime focus and sleep quality can be surprisingly noticeable.

Blue Light, Screens and Your Brain at Night

Phones, tablets, laptops and TVs all emit blue light in a range your brain is particularly sensitive to. From an evolutionary standpoint, blue light means daylight, and when those retinal cells detect it, your brain gets a clear signal to stay alert, focused and awake. The problem is your brain can't tell the difference between a bright summer afternoon and a glowing screen a metre from your face at 10pm. It responds the same way either way.

Cortisol stays elevated. Melatonin gets delayed. You don't feel tired when you expect to, so you stay up later. And when you do eventually fall asleep, the quality suffers, deep sleep and REM can both be reduced, which affects physical recovery, memory consolidation and mood the next day.

Over time it compounds. Late nights, inconsistent sleep, and groggy mornings start to feel normal when they don't have to be. It's not about avoiding screens entirely, it's about managing timing and intensity. Dimmer, warmer lighting in the evening helps. So does limiting bright screens in the hour or two before bed.

Elite athletes take this seriously. Erling Haaland is well known for his disciplined sleep habits, including wearing blue light glasses in the hours before bed. For high performers, sleep is the most effective legal recovery tool available, muscle repair, hormonal balance, mental clarity. If managing evening light exposure supports a Premier League striker, it can probably help with a Monday morning meeting too.

Blue Light Glasses vs. The Alternatives

Most devices now have a Night Screen Mode that shifts the display toward warmer, yellower tones. It helps, but it doesn't fully solve the problem. Colour temperature is only part of it- Night Mode doesn't completely block the high-energy blue wavelengths that are most linked to melatonin suppression.

Blue light glasses work differently. They filter specific wavelengths before they reach the eye, regardless of what you're looking at, phone, laptop, TV, office LEDs. One solution that travels with you across all of them. They also cut down on screen glare, which helps with eye strain during long sessions.

Who Benefits Most

Office workers spending hours under artificial lighting are an obvious one. Long screen sessions cause dry eyes, headaches, blurred focus and that familiar mid-afternoon mental fog. Blue light glasses help the eyes relax during those stretches without you having to change anything else about your setup.

Night-time screen use is where the sleep impact really shows. Sitting with a laptop or tablet late in the evening exposes your eyes to concentrated blue light exactly when your body should be winding down. Wearing blue light glasses in those hours makes the transition to sleep noticeably easier for a lot of people.

Kids are worth mentioning separately. Their eyes are clearer than adults', which means more blue light reaches the retina. Gaming, homework on tablets and watching TV in the bedroom can flood a room with blue light, especially large TVs, which bounce light off walls and ceilings in a way phones don't. That kind of exposure in the evening can delay melatonin release in children and affect how well they sleep and how they function at school the next day.

Even casual users, adults watching a movie late at night or doing a bit of scrolling before bed, can benefit. Large screens can quietly keep cortisol elevated and melatonin suppressed without you realising it. Wearing blue light glasses for a couple of hours before bed is a low-effort change that supports better sleep quality over time.

Digital Eye Strain FAQ

Digital eye strain isn't just tired eyes. Long screen sessions can cause dry eyes, headaches, blurry vision and tension through the neck and shoulders. It happens because your eye muscles stay locked in one position to maintain focus on a bright screen, and you blink far less than normal without realising it.

How often should I take breaks?

The 20-20-20 rule is worth following. Every 20 minutes, look at something 20 feet away for 20 seconds. It sounds simple because it is, but it works. Focusing at a fixed distance for extended periods fatigues the eye muscles, and looking at something far away lets them relax and reset. A tree outside the window, a rooftop, anything in the distance. Set a timer if you need a prompt, and try to stand up and move around while you're at it.

Hydration and Eye Health

It's easy to forget to drink water when you're deep in work, but your eyes notice. Staying hydrated helps maintain moisture in the eyes, which reduces that dry, scratchy feeling after long screen sessions. Keep a bottle nearby and sip throughout the day. It's also worth watching caffeine intake, too much coffee can contribute to dryness, so it's worth balancing it out with water.

How to Choose the Right Pair

Most of iPOP's blue light frames are made from TR90, a lightweight, flexible material that holds its shape well and is comfortable for long wear. Frame fit matters too. The bridge should sit securely without sliding, and the temples shouldn't pinch. Good coverage around the sides helps prevent stray light getting in from angles. Every pair we ship comes with a soft microfibre case that doubles as a lens cloth.

Clear vs. Tinted Lenses

Not all blue light lenses are the same, and the tint level makes a real difference depending on how and when you're using them.

1. Clear Lenses

What they do: Filter around 50% of blue light, targeting the harshest wavelengths in the 400nm–455nm range. Some retailers charge significantly more for glasses at this spec by implying proprietary lens technology, the performance is comparable.

Best for: Office work, studying, casual scrolling and watching TV. iPOP focuses on clear lenses because they maintain colour accuracy, you get meaningful blue light protection without everything looking yellow. Popular with students, office workers and everyday device users.

2. Yellow and Amber Lenses

What they do: Block more blue light, up to 75%. The yellow tint boosts screen contrast, which is why they're often marketed as gaming glasses.

Best for: Intense, multi-hour gaming sessions or people with high sensitivity to light. Worth knowing that they do distort colour, whites take on a yellow cast and blues shift toward green, which most people find fine for gaming but distracting for anything else.

3. Red and Orange Lenses

These block 100% of blue light and a significant portion of green light up to around 550nm. They're favoured by biohackers and sleep optimisers who put them on two or three hours before bed to ensure zero blue light exposure.

The downside is obvious, the world turns entirely red, making them unsuitable for almost anything other than winding down. Wearing them during the day can make you feel drowsy because your brain interprets the filtered light as a signal that it's nearly bedtime.

Conclusion

Blue light glasses do a straightforward job,  they reduce the amount of high-energy light reaching your eyes from screens, which helps with eye strain during the day and sleep quality at night. There's also emerging evidence that they can benefit people recovering from concussion, where light sensitivity and disrupted sleep are common and frustrating symptoms.

You don't need to overhaul your life. Getting outside in the morning, managing screen brightness in the evening, and wearing a pair of blue light blocking glasses in the hours before bed are small, consistent habits that add up. If screens are a regular part of your day, and for most of us they are, it's worth considering.