Do Blue Light Glasses Work? A Science-Based Analysis - Axon Optics (2022)

Do blue light glasses work to protect your eyes from digital screens?

In recent years, we’ve become more aware of the blue light from screens bombarding our eyeballs. Maybe your parents told you that watching too much TV would rot your brain or turn you into a couch potato.

Well, rotten brains and couch-potatoes aside, let’s take a serious look at blue light. Is it actually harmful? And if so, do blue light glasses work to address it?

What Is Blue Light and Where Does It Come From?

Common sources of blue light include the sun, fluorescent lighting, LED lighting, and digital devices like computers and smartphones. You see, visible light comes in a spectrum of wavelengths. Each wavelength has its own energy level, and blue light actually has the highest energy of any wavelength on the visible spectrum.

Because of that, blue light has the potential to impact your eye health more than other types of visible light. Digital screens of all kinds — computers, smartphones, televisions, tablets — emit lots of this high-energy blue light.

But Is Blue Light Harmful?

Because of all that blue light, it makes logical sense that spending a lot of time on digital devices could potentially lead to eye strain. However, studies into the potential harm caused by blue light haven’t been too conclusive. Research is ongoing, but there have been mixed results thus far.

If you suffer from migraines and are trying to determine if blue light glasses work for migraine or light sensitivity, you can find out here.

Blue Light and In Vitro Injury to Ocular Surface Cells

A 2019 in vitro study (meaning the study was conducted in an artificial environment, not done on actual people), researchers concluded that blue light injured human ocular surface cells, and that a shade could protect those cells. But this recommendation was theoretical, as living human beings were not used in the study.

Blue Light and Cataracts — Rats! (Literally)

In 2020, a study of rats revealed a correlation between increased blue light exposure and development of cataracts. But as you know, people — with a handful of exceptions — are not rats.

The Experts Weigh In on Blue Light

While the American Academy of Ophthalmology recognizes digital eye strain, it stops short of asserting that blue light causes eye damage or adversely affects eye health. See the following excerpts from a 2021 article published on the AAO website:

“Long hours staring at digital screens leads to decreased blinking. Blinking less sometimes causes a series of temporary eye symptoms known as eye strain. But these effects are caused by how people use their screens, not by anything coming from the screens. The best way to avoid eye strain is to take breaks from the screen frequently.

“The American Academy of Ophthalmology does not recommend blue light-blocking glasses because of the lack of scientific evidence that blue light is damaging to the eyes.

In short, there are other factors in play that may be contributing to your eye strain. To put it plainly, your discomfort probably isn’t caused by the blue light itself, but by effects like decreased blinking. You should also keep in mind that experiencing eye strain isn’t the same thing as having eye disease.

Passing symptoms of eye strain aside, the big unanswered question is this:

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Does blue light actually damage your eyes?

No, blue light will not damage your eyes. While it’s often asserted online and in the media that it does, there is no evidence to support this claim.

The Bigger Issue of Eye Strain

According to data from DataReportal published in March 2022, the average American spends 7 hours and 4 minutes in front of a screen every day.

If you’ve felt like your eyes were bugging you after hours in front of a computer or other screen, you may have experienced digital eye strain. Digital eye strain is also known as computer vision syndrome, or CVS.

VisionCenter.org estimates that 90% of people who use digital devices experience symptoms of digital eye strain, including:

  • Pain in the shoulders, back, or neck
  • Trouble focusing between near and far
  • Discomfort or strain in the eyes
  • Difficulty keeping eyes open
  • Increased light sensitivity
  • Trouble concentrating
  • Headaches
  • Blurred vision
  • Double vision
  • Reduced blinking
  • Dry eyes
  • Eye fatigue
  • Eye redness
  • Tearing
  • Itchy eyes

The severity of your symptoms will depend largely on how long you’ve been using the digital device. Underlying eye conditions will also have an effect, as will other factors such as glare on the screen from overhead lights.

Fortunately, the symptoms of digital eye strain or computer vision syndrome are usually temporary, and will soon subside when you stop using your devices. Sometimes, it’s possible for symptoms to continue for a while after that.

Other Factors Contributing to Digital Eye Strain

Pay attention to your eye movements the next time you’re using a computer or other digital device. You’ll probably notice that your eyes spend a lot of time shifting focus.

Maybe you’re looking for a piece of code. You could be hunting in the virtual distance for the next zombie. Or maybe you’re scrolling social media posts for the ones that you actually want to read. That’s a lot of work for your eyes.

Adding to those demands is the glare caused by ambient lighting, or the contrast on your computer screen.

Plus, when your eyes are focused on something closer to you, like a screen, smartphone, or book, your pupils tend to contract and become strained. On the other hand, pupils tend to relax when looking at things further away.

Many factors — shifting focus, glare, contrast, infrequent blinking, and closeness — can easily lead to the symptoms of digital eye strain listed above. Sure, your eyes may be irritated after a long day on the computer, but that doesn’t mean blue light is the real culprit. Maybe you just need a break.

Do Blue Light Glasses Work? A Science-Based Analysis - Axon Optics (2)

What Are Blue Light Glasses?

So if we aren’t sure that blue light actually damages your eyes, what does that say about the effectiveness of blue light glasses?

Blue light blocking glasses are a type of vision eyewear made with special lenses designed to filter out blue light but let other types of light through. Blue light blocking glasses are not harmful or bad for your eyes, but how do they work?

Blue light glasses work by protecting your eyes from high-energy blue wavelengths, reducing the potential for eye damage from prolonged exposure. Generally, the purpose of blue light glasses is to reduce digital eye strain and improve sleep quality.

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Now that you know what blue light glasses are, let’s talk about whether they actually work.

Do Blue Light Glasses Work? A Science-Based Analysis - Axon Optics (3)

What the Science Says About Blue Light Glasses

Research released in February of 2021 indicates that blue light lenses may have no effect at relieving digital eye strain symptoms. 120 eye-strain-symptomatic computer users were asked to complete a 2-hour computer task. Each person was randomly given either clear (placebo) glasses or blue blockers, but each was led to believe they were wearing blue blockers.

After 2 hours, there was no significant difference in the feedback given from each group. Even more telling is that there was no difference in the eye strain symptom score between the two groups. In short, the blue light glasses had no effect.

Add this study to the fact that blue light may not even be the real culprit for your digital eye strain, and there are serious doubts about the effectiveness of blue light blocking glasses.

Mixed Reviews and Ongoing Research

A 2017 study of 80 computer users found that after one month of using lenses coated with a blue blocking coating, one-third felt they received benefit. They claimed that the glasses improved vision and reduced glare while they used digital screens.

It should be pointed out that this study was funded by a maker of blue light glasses.

Other studies are currently underway, like this one which intends to take a closer look at whether blue light lenses provide users with any definitive benefit.

Blue Light Glasses and Sleep Quality

While The American Academy of Ophthalmology doesn’t state that blue light is damaging to the eyes, there are many people who say wearing blue blockers in the evenings helps them sleep better.

Maybe it has to do with circadian rhythm or simply reducing harsh stimuli before heading for bed. Whatever the reason, some data seems to suggest that blue light blocking lenses may have sleep-related benefits in some people. But let’s take a closer look at those studies.

Blue Blockers, Bipolar Patients, and Sleep Quality

A 2020 study randomized 20 hospitalized bipolar patients in a manic state, with some wearing clear glasses and others wearing blue blocking glasses for 7 days. During that time, their motor activity, sleep, and wakefulness patterns were monitored. After 5 nights, the blue blocker group experienced significantly better sleep efficiency and less wakefulness after getting to sleep.

These findings suggest that blue blocking glasses may help hospitalized manic patients sleep better. However, the sample size of the study was small, and no baseline data was gathered before the study.

Athletes, Blue Light, and Falling Asleep

In a 2019 study, 15 healthy athletes were instructed to wear either blue blocking or transparent glasses for 3 hours before going to bed. Their sleep was monitored for 9 nights in a row, and they were given a set of guidelines to follow for their nighttime routine. While blocking the short-wavelength blue light was “mainly effective” in shortening the time it took them to get to sleep, there was no impact on total sleep time or wakefulness after they got to sleep.

Blue Light’s Effect on Melatonin in Healthy Adults

In 2011, a small study of a handful of healthy adults measured nighttime melatonin levels under varying conditions. The conditions included 2 hours of being blindfolded, then 90 minutes of exposure to various irradiance blue LED lamps, white fluorescent lamps, and followed by 90 minutes of additional blindfold time. In this study, melatonin concentration was found to be suppressed significantly with some blue light irradiances. However, actual sleep quality was not assessed.

The evidence that blue light significantly suppresses melatonin levels could mean that in theory, wearing blue blockers may help you sleep better at night. However, that doesn’t mean you should rely on them to prevent eye strain, especially when there are other reliable ways to do this.

In 2019, another study of blue light filtering glasses provided subjectively better sleep when worn in the evening, but researchers couldn’t verify this with objective measurements of sleep parameters.

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How to Protect Your Eyes From Potentially Harmful Light

If you’re experiencing headaches, eye strain, or dryness, then blue light glasses won’t help much. These are symptoms due to photophobia, or abnormal light sensitivity. Instead, you’ll need light sensitivity glasses specifically designed for people with photophobia.

If you’re wondering if blue light filtering is worth it when trying to relieve eye strain, the answer is no. The only thing blue light glasses help with is improving the time it takes to fall asleep and overall sleep quality.

Wear Light Sensitivity Glasses

Light sensitivity glasses made by Axon Optics have been shown to reduce symptoms of photophobia, such as migraine. Their precision-tinted lenses folder out only the specific wavelengths of light known to pose the most risk, letting the rest in. They’re available in prescription and non-prescription with indoor and outdoor lenses.

Do Blue Light Glasses Work? A Science-Based Analysis - Axon Optics (4)

Axon Optics photophobia glasses, also called migraine glasses, have been studied extensively and shown effective against light sensitivity symptoms like migraine. In a clinically-validated HIT-6 (headache impact test) survey, here are just some of the results that were found.

  • 85% experienced a decrease in headache impact
  • 33% fewer headache days
  • 40% decrease in light sensitivity impact
  • 85% of users reported decreased light sensitivity

If your digital eye strain is due to photophobia, light sensitivity glasses are a much better choice than blue light blocking glasses. On that note, here’s an amusing but true story.

We recently heard from a customer asking about returning a pair of our glasses. She had ordered her daughter a pair late last year, which she wears all the time for her remote computer job. The glasses were so helpful that they ordered a spare pair a few months later.

After wearing the “second pair” of glasses several times, the daughter reported that they didn’t have any effect. Thinking they might be defective, her mom asked about a return. Later, however, she came back to report that the ineffective pair her daughter had tried were actually NOT Axon Optics glasses, but a pair of blue light blocking glasses they’d purchased before buying anything from Axon.

That’s a true story that illustrates the difference between the benefits of light sensitivity glasses and the unproven benefits of blue light glasses!

Do Blue Light Glasses Work? A Science-Based Analysis - Axon Optics (5)
Do Blue Light Glasses Work? A Science-Based Analysis - Axon Optics (6)

Take a Break, Would Ya?

As if you needed another excuse to catch a break, simply giving your eyes a few seconds of relief now and then can go a long way to reducing eye strain. Many experts recommend the 20-20-20 rule. That is, every 20 minutes, focus your eyes on something about 20 feet away for 20 seconds. It can relax your eyes and give them a much needed “time out.”

Use Artificial Tears

A little lubrication for your eyes can go a long way to preventing the dryness and irritation you might otherwise be dealing with.

Sit Properly

As we talked about earlier, the close proximity of your screen to your eyes can be a contributing factor to eye strain. Try sitting further back from your computer. Aim for about 25 inches, or arm’s length. It might also help to position your chair or desk so you look slightly downward at your screen.

And like your parents probably cautioned you as a teenager, stop slouching! Neck, back, shoulder pain could be a result of poor posture. So stay upright and look at your screen with your eyes, not your head or neck. A periodic stretch and a few backward shoulder rolls might help, too.

Summing It All Up

When it comes to easing digital eye strain, blue glasses do not work. The best way to reduce symptoms associated with increased exposure to screens is to practice good habits, take frequent breaks, and see your doctor if you feel you’re more sensitive to light than normal.

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References

Zhao Z.-C., Zhou Y., Tan G., Li J. Research progress about the effect and prevention of blue light on eyes. Int. J. Ophthalmol. 2018;11:1999–2003. doi: 10.18240/ijo.2018.12.20. [PMC free article] [PubMed] [CrossRef] [Google Scholar]

S. Singh, L.E. Downie, A.J. Anderson. Do Blue Blocking Lenses Reduce Eye Strain From Extended Screen Time? A Double-Masked, Randomized Controlled Trial. American Journal of Ophthalmology. February 11, 2021

Vimont, C., & Hazanchuk, V. (2021, March 10). Should You Be Worried About Blue Light? American Academy of Ophthalmology. https://www.aao.org/eye-health/tips-prevention/should-you-be-worried-about-blue-light

Tsz Wing Leung, Roger Wing-hong Li, Chea-su Kee. PLoS One. 2017; 12(1): e0169114. Published online 2017 Jan 3. doi: 10.1371/journal.pone.0169114. PMCID: PMC5207664

Knufinke M, Fittkau-Koch L, Møst EIS, Kompier MAJ, Nieuwenhuys A. Restricting short-wavelength light in the evening to improve sleep in recreational athletes – A pilot study. Eur J Sport Sci. 2019;19(6):728-735. doi:10.1080/17461391.2018.1544278

Niwano Y, Iwasawa A, Tsubota K, Ayaki M, Negishi K. Protective effects of blue light-blocking shades on phototoxicity in human ocular surface cells. BMJ Open Ophthalmology. 2019;4(1):e000217. doi:10.1136/bmjophth-2018-000217

Wang Y, Zhang M, Sun Y, et al. Role of short-wavelength blue light in the formation of cataracts and the expression of caspase-1, caspase-11, Gasdermin D in rat lens epithelial cells: insights into a novel pathogenic mmechanism of cataracts. BMC Ophthalmol. 2020;20:289. doi:10.1186/s12886-020-01565-z

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West KE, Jablonski MR, Warfield B, et al. Blue light from light-emitting diodes elicits a dose-dependent suppression of melatonin in humans. Journal of Applied Physiology. 2011;110(3):619-626. doi:10.1152/japplphysiol.01413.2009

Henriksen TEG, Grønli J, Assmus J, et al. Blue-blocking glasses as additive treatment for mania: Effects on actigraphy-derived sleep parameters. J Sleep Res. 2020;29(5):e12984. doi:10.1111/jsr.12984

FAQs

Are blue light glasses scientifically proven? ›

ROSENFIELD: Both of the studies actually found that the blue-blocking filters have no effect, no significant effect on digital eye strain. This didn't really come as a major surprise to us because there really is no mechanism whereby the blue light should be causing digital eye strain.

How do blue light glasses work science? ›

Blue light glasses work by protecting your eyes from high-energy blue wavelengths, reducing the potential for eye damage from prolonged exposure. Generally, the purpose of blue light glasses is to reduce digital eye strain and improve sleep quality.

Do ophthalmologists recommend blue light glasses? ›

The American Academy of Ophthalmology says you don't need them and has gone on record as not recommending any kind of special eyewear for computer users. The organization says blue light from digital devices does not lead to eye disease and doesn't even cause eyestrain.

Are there any downsides to blue light glasses? ›

The disadvantages of having blue light protecting computer glasses: The glasses with blue light filters change the color of everything you see in the yellow tint. This often causes difficulties to read the screens. The light blue glasses increase the number of complaints of scotopic vision loss.

Do blue light glasses Work 2022? ›

In short, the answer is yes. There is no evidence that shows signs of potential damage due to wearing blue light glasses all day. In fact, these glasses provide added protection to keep your eyes fatigue-free all day. Are blue light glasses with a tint different from clear ones?

How can you tell if blue light glasses are fake? ›

To check if they're tinted, go outside and hold your glasses up toward the blue sky on a clear, bright day. If the sky looks warmer or yellow through the lenses, then they're blocking at least some blue light.

Do blue light glasses actually work for headaches? ›

For many years, blue light blocking glasses have also been thought to help with the eye strain, dryness, blurred vision, and headaches. However, newly published research suggests that they actually aren't effective at reducing headaches and other symptoms related to digital eye strain.

Can you wear blue light glasses all day? ›

Yes, it is okay to wear blue light glasses all day. Whether you're wearing blue blocking glasses without a prescription or a special blue filter on your regular glasses, your eyes will not suffer any negative effects from wearing them all the time.

What is the difference between blue light glasses and computer glasses? ›

Blue light-blocking glasses (also called blue-cut) are effective only when they provide some degree of protection against the entire spectrum of blue light. Blue light glasses for daytime are clear and they provide protection from computer screens. Hence they can be called computer glasses.

Should I wear blue light glasses watching TV? ›

You should definitely wear a precision pair of blue light blocking glasses when watching the TV, this includes watching daytime television shows. There is too much high intensity blue light present from television screens so you need to filter it down to protect against digital eyestrain and headaches.

Should you wear blue light glasses at computer? ›

If you spend a lot of your daytime hours under artificial light or working at a computer, or both, it makes perfect sense to wear your blue light filter glasses during the day. Still, certain kinds of blue light are necessary for regulating our circadian rhythms and endocrine systems.

Why can I still see blue with blue light glasses? ›

Blue light glasses with tinted lenses (amber, yellow, orange, red, etc.) alter the colors perceived on a screen. These colors appear warmer, but it allows better protection against blue light. On the other hand, blue light glasses with transparent lenses do not change the colors of the screens.

Is anti-glare or blue cut better? ›

Blue Cut Glasses

They are important to use for people who spend long hours working with screens and are at a higher risk of developing premature eye damage and loss of visual acuity. In the debate between anti-glare vs blue cut lenses, the latter serves better for computer-related eye strain.

Which glasses block the most blue light? ›

Glasses with red- or orange-tinted lenses block a wider spectrum and larger percentage of blue light. However, they can also distort the colors on your computer screen. Clear or light yellow-tinted glasses are designed to target a narrower range of high-energy blue light commonly emitted from artificial sources.

Are expensive blue light glasses worth it? ›

Blue light glasses do not prevent eye strain from electronics, but studies suggest they may help promote better sleep. Consumer Reports tested three pairs of blue light glasses and found that the least expensive pair blocked the most amount of blue light.

Is there a difference between cheap and expensive blue light glasses? ›

Cheap blue light glasses do not filter the complete range of harmful wavelengths. Research has proven that the peak wavelength from artificial light is at 455 nanometres. None of the cheap pairs target this wavelength.

Which eyeglass is best for computer users? ›

Eyezen lenses are computer glasses made to protect your eyes while you work on your computer, tablet or smartphone. They can help you see your screen more clearly, whether it be large or small, and can help protect your eyes from the harmful blue light given out by computer screens.

Why do my blue light glasses reflect green? ›

The green or blue reflection on your glasses is the color of the remaining 1% reflection on the lenses of your glasses the anti-reflective coating could not eliminate. This colored reflection is also known as the bloom. Depending on the manufacturer the color will be more tuned to a dark green or a dark blue.

How do you test a blue lens? ›

A convenient way of testing the blue cut lenses is to see what colour the computer glasses reflect. If the colour reflected is blue, it indicates that the glasses can filter out the blue light. On the other hand, violet or purple reflection hints that the lenses are not filtering the blue light effectively.

What benefits do blue light glasses have? ›

Blue light glasses might not work for everyone, but they may help reduce potential damage to the eyes from prolonged exposure to blue light.
...
What are Blue Light Glasses?
  • Improve visual performance.
  • Improve sleep quality.
  • Alleviate eye fatigue.
  • Conserve macular health.
13 Aug 2021

Can blue light glasses damage your eyes? ›

Can blue light blocking glasses damage your eyes? No. Blue light blocking glasses don't damage your eyes. In fact, blue light glasses shield your eyes from the damaging effects of blue light, which is the type of light that's emitted from electronic devices, like tablets, smartphones and laptops.

Is blue light actually harmful? ›

Blue light from electronic devices is not going to increase the risk of macular degeneration or harm any other part of the eye. However, the use of these devices may disrupt sleep or disturb other aspects of your health or circadian rhythm.

Do blue light glasses help with blurry vision? ›

What Scientific Research Says About Blue Light Glasses. So far, research doesn't support the idea that blue light glasses can relieve digital eyestrain symptoms, such as headaches, dry eyes, or blurred vision.

What do eye doctors say about blue light glasses? ›

There is also no evidence that blue light glasses help reduce symptoms associated with increased exposure to screens. Instead, eye doctors suggest that the way people use their screens may cause CVS symptoms such as eye fatigue, headaches, and poor sleep.

Why do I get a headache when I wear blue light glasses? ›

Some people have reported headaches from blue-light blocking glasses, but there haven't been any reliable studies to support or explain these reports. It is not uncommon to have headaches when you first wear new glasses or your prescription has changed.

Do blue light glasses help with astigmatism? ›

In fact, excessive screen time can even cause digital eye strain, particularly for those with uncorrected astigmatism. Fortunately, blue light blocking lenses can alleviate this discomfort, and make working on your laptop or texting on your phone much more enjoyable.

Do blue light glasses actually work for headaches? ›

For many years, blue light blocking glasses have also been thought to help with the eye strain, dryness, blurred vision, and headaches. However, newly published research suggests that they actually aren't effective at reducing headaches and other symptoms related to digital eye strain.

Is blue light damaging? ›

Retina damage: Studies suggest that continued exposure to blue light over time could lead to damaged retinal cells. This can cause vision problems like age-related macular degeneration.

Do computer glasses really work? ›

Short answer: probably not. Most computer glasses are designed to filter out blue light — high-energy light rays emitted from the display screens on your computer, tablet and phone.

Do blue light filters on phones work? ›

Android Device

Most Android devices should have built-in blue light filters that can be enabled or disabled from the Settings screen.

Can blue light glasses damage your eyes? ›

Can blue light blocking glasses damage your eyes? No. Blue light blocking glasses don't damage your eyes. In fact, blue light glasses shield your eyes from the damaging effects of blue light, which is the type of light that's emitted from electronic devices, like tablets, smartphones and laptops.

Can you wear blue light glasses all day? ›

Yes, it is okay to wear blue light glasses all day. Whether you're wearing blue blocking glasses without a prescription or a special blue filter on your regular glasses, your eyes will not suffer any negative effects from wearing them all the time.

When should I wear blue light glasses? ›

The bottom line is this: whenever you're working with digital screens or under artificial lighting, it pays to wear blue light glasses. When you're out in the natural sunlight, you don't need them. But in a world of omnipresent screens, it's always a good idea to have them on hand.

What does blue light do to your brain? ›

Light from electronic screens comes in all colors, but the blues are the worst. Blue light fools the brain into thinking it's daytime. When that happens, the body stops releasing a sleep hormone called melatonin. Melatonin is nature's way of helping us wind down and prepare for bed.

Is Bluelight filtering worth it? ›

Wearing blue light glasses may sound like a good solution, but a recent study determined there was little evidence to support the use of blue-blocking filters in the prevention of digital eye strain.

What benefits do blue light glasses have? ›

Blue light glasses might not work for everyone, but they may help reduce potential damage to the eyes from prolonged exposure to blue light.
...
What are Blue Light Glasses?
  • Improve visual performance.
  • Improve sleep quality.
  • Alleviate eye fatigue.
  • Conserve macular health.
13 Aug 2021

What is the difference between computer glasses and blue light glasses? ›

Blue light glasses for daytime are clear and they provide protection from computer screens. Hence they can be called computer glasses. Blue light blocking glasses for nighttime are tinted and they should block 100% of blue light and 100% of green light across the entire spectrum to be effective in promoting sleep.

How can I test my blue light glasses at home? ›

Perform the blue sky computer glasses blue light filter test. It is as easy as it sounds. Just wait for a clear day and hold your glasses towards the blue sky. During normal wear, the lenses look clear, but they actually have a slight yellow tint if filtering the recommended 30% of blue light.

Is anti radiation and blue light the same? ›

Main differences between anti glare glasses vs blue light glasses. Blue Light Glasses are specifically designed to block and filter the harmful blue light. Anti Glare glasses help you see more clearly, but do not protect your eyes. Blue Light Glasses protect your eyes during the day and promote a good sleep at night.

Does iPhone screen emit blue light? ›

Most electronic devices emit blue light and your iPhone is no exception. While blue light is hard to avoid, getting too much of it before going to bed can cause sleeplessness. This is why many people are looking for ways to reduce blue light on their iPhone, which Apple made easy to do with the Night Shift feature.

Does Bluelight cause insomnia? ›

More so than any other color, blue light messes with your body's ability to prepare for sleep because it blocks a hormone called melatonin that makes you sleepy. Bottom line: You're less drowsy than usual at night, and it takes you longer to fall asleep.

Is Dark mode better for your eyes? ›

Dark mode doesn't directly reduce eye strain, but it can offer some relief. For example, in a dim setting, a bright screen has your eyes working harder. On the contrary, a dark screen in a brightly lit room will have the same effect. -Easier to read.

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