What s the difference between blue light glasses and computer glasses
Do blue-light filtering glasses work?
In 2017, a systemic review found three studies looking at blue-light filteringlenses and was published in the Journal of the College of Optometrists.The first thing they found is that there was no difference between regularlenses and blue-light filtering lenses on: * contrast sensitivity * colour visionIn one study on eye strain / eye fatigue, the clear blue-filtering lenses didnot cause any benefit over the regular lenses.The study found a slight benefit if using “strong” blue-light filteringglasses (these ones were slightly brown-tinted) for “pain around/inside theeye,” “eyes were heavy,” and “eyes were itchy.”So, if you’re a programmer or spend all day in artificial lighting, it mightbe worth experimenting with “heavier” blue-light filtering, perhaps even likethe popular Gunnar gaming glasses, which are tinted slightly yellow. Itdoesn’t seem like cutting out a modest 10–20% of blue and having clear lensesmostly unaffected will do enough for combating eyestrain.Gunnar Glasses have higher blue-filtering levels so they’re tinted a bityellowAs of the time of this 2017 review, there were no direct studies on blue-lightfiltering glasses and macular health. This is a bummer because there are a lotof worries between the connection of age-related macular degeneration and bluelight.The authors wrote:> There is a need for high-quality studies to address the effects of blue-> blocking spectacle lenses on visual performance, and the potential> alleviation of symptoms of eyestrain and/or visual fatigue.So, in terms of eyestrain and blue light filtering glasses, we might be on ourown to make inferences on our own, do our own experiments such as trying aheavier blue-light filtering tint, and see what work’s best.The good news? So far, there seem to be no known side-effects. Researcherswrote:> None of the included studies reported on adverse effects associated with the> use of blue‐blocking lenses.
My opinion on blue-light filtering glasses
I’ve bought specific computer glasses in the past but stopped wearing them. Iwasn’t suffering from eyestrain but was looking to optimize health andproductivity. But today I am wary about the potential of a small shift inmagnification affecting my eyesight (I could see better than 20/20 vision thelast time I was checked.) But if you’re struggling with eyestrain,experimenting with a “stronger” blue-light filtering like the Gunnars, whichcan be bought at 35% (slight tint) and 65% (yellow tint) of blue removed.And if I needed prescription glasses, I would be personally wary of coating myall-around glasses with blue-light filtering. Blue light from a natural sourcelike the sun is normal, healthy, and may have additional benefits we have yetto discover. By cutting out natural blue light too, well, we don’t know whatcomplex systems we’re playing with. For example, so let’s say you’re walkingto work or eating lunch outside on a nice day, you’d want those natural blue-light rays coming from overhead from the sun. Natural blue-light hasenergizing and anti-depressive effects, so the goal isn’t to get rid ofnatural blue light, but to avoid beaming copious amounts of artificial bluelight directly into your eyes via LEDs for 12 hours straight.
Evidence that blue-blocking glasses work
In a 2018 study, researchers took first-year college students with sleepproblems and gave them blue blockers.> those wearing amber glasses first tended to sleep longer and have fewer> awakenings at night than those wearing blue lensesNot only did they get better sleep, but their mood also improved as well. Andall those benefits disappeared once researchers switched out their amber,blue-blocking lenses for blue coloured lenses (making everything blue.)In another 2018 study, researchers looked at people who were either doingendurance or weight-lifting training and blue light exposure at night. Onegroup got amber lenses, and the other got clear lenses as the control. All ofthem had moderate to good sleep already. They put the glasses on 3 hoursbefore bed.In as little as nine days of using them, researchers found:> Results indicate that blocking short-wavelength light in the evening, as> compared to habitual light exposure, significantly shortened subjective> sleep onset latency, improved sleep quality, and increased alertness the> following morning.In a third 2018 study, researchers compared using blue blockers at nightversus opening the blinds early in the morning. Researchers measured theirmelatonin levels and found:> We found that a decrease in evening blue light exposure led to an advance in> melatonin and sleep onset on workdays. Increased morning light exposure> advanced neither melatonin secretion nor sleep timing.>> …our findings show that controlling light exposure at home can be effective> in advancing melatonin secretion and sleep…”And in a 2009 study, one group wore yellow-tinted glasses while another woretrue blue-blocking glasses that were amber. Researchers found:> At the end of the study, the amber lens group experienced significant> improvement in sleep quality relative to the control group… Mood also> improved significantly relative to controls.This 2009 study also illustrated an important fact—it might take a longer timefor the blue-blockers to work for some people. It took nearly three weeks forthe averages to beat the control.There are many more studies related to reducing artificial, blue light atnight for improved health that we won’t cover today. A few more for thoseinterested:
Do blue light glasses block all blue light?
They can, but they usually don’t — and for good reason.Lenses that block 100% (or close to 100%) of blue light have a deep orange oramber tint, greatly changing the way everything looks around us.However, lenses with 10% or 20% protection can appear almost clear. Theseusually make more sense for all-day wear. Many computer- or gaming-specificglasses have visibly yellow lenses, since they tend to block around 50% or 60%of blue light.You may want to experiment with different levels of protection to see whatworks best for you.
What’s the difference between blue light glasses and computer glasses?
Most computer glasses are also blue light glasses, but not necessarily theother way around.Computer glasses usually have a higher degree of blue light protection plusslight magnification to further reduce eye fatigue. Computer glasses withmagnification act like reading glasses, except they optimize intermediate-distance vision instead of near vision, and they have blue light protection.If these specialized glasses work for you, the additional comfort cantranslate into increased work productivity.Gaming glasses also tend to include slight magnification and mid-range bluelight protection.Clear everyday blue light glasses may be better for general use and minor eyefatigue. These lenses block a low degree of blue light and offer moreflexibility in terms of style and facial fit.If you’re not sure how to find the best computer glasses for your needs, it’salways a good idea to consult with your eye doctor.
Q: How much blue light do blocking glasses filter?
A: Most glasses filter 80% of blue light, allowing you to see most blue colorwhile still enjoying the benefits of blue light blockers. Blocking amountsdepend on the brand, so be sure to consult your product’s information for acomplete answer.
Q: Why are some blue light blocking glasses tinted orange or yellow?
A: Some cheap blue light blocking glasses are tinted orange or yellow to blockout blue light. This is the cheapest and most basic way to block blue light,and it causes everything to look orange or yellow.
Q: Do blue light glasses filter sunlight?
A: Yes, all visible light, including light from the sun, a smartphone, orlightbulb, contains blue light. Blue light glasses filter all blue light, andthey don’t discriminate based on the source.
Q: Do blue light blocking glasses prevent eye disease?
A: There’s no evidence that blue light blocking glasses prevent eye disease.Be cautious of any company claiming that their product can prevent eyedisease.
Q: Can you wear blue light blocking glasses as sunglasses?
A: No, blue light blocking glasses are not designed to be worn as sunglasses,even though some block both UV radiation and blue light. They should not beused as a substitute for sunglasses.
Reducing blue light from your computer screen: a virtual blue glare screen
By far the best way to reduce the amount of blue light emitted by digitalscreens is through software manipulation of the colors displayed.Blue light filtering apps that use color transform approach reduce contrastfar less than any other blue glare screen, such as apps that use overlayapproach or physical screen glare filters (screen protectors or coloredfilters). This is important because low text to background contrast is anothersource of computer eye strain headache.There are two ways to reduce emissions of blue light (and subsequently eyestrain headaches). Both are free, use color transform approach, and can beused simultaneously to complement each other and cancel out some of theirweaknesses:
6. Blue light filtering eyewear as glare screen.
Tinted lenses might be an excellent solution for eye strain headache. Glasses(wraparounds in particular) reduce the amount of blue light entering your eyeswhether it comes from lighting or digital displays.Another clear advantage of eyewear over some other solutions is that itdoesn’t provoke lighting wars. Eyeglasses only affect you – the lightingconditions of your coworkers (many of whom are not blue and fluorescent lightsensitive) remain unchanged.Consider adding power to the glasses to make your eyes fatigue less, if youfeel your computer eye strain may also be caused by near work required bydigital devices. Most glasses marketed as “computer glasses” do that.Finally, it is wise to get anti-reflective (AR) coating on both inside andoutside of your glasses’ lenses because of its several benefits: increasedtransmissibility, reduced surface reflections and ghost images, decreasedglare and UV transmission (Anti-reflective coatings reflect ultravioletradiation; 2008).There are many spectacles that claim to filter blue light available on themarket. The most obvious characteristic of blue filters is their color:yellow, amber, orange, red, brown… However, despite appearing similar in termsof their color appearance (and despite their blue-block claim), differentlenses of the same color may have dramatically different spectral transmissioncharacteristics (The visual effects of intraocular colored filters; 2012).If you think blue light filtering eyewear is what you need and you want tomake an informed purchasing decision see this collection of 10 blue lightfilters to relieve computer eye strain, help you sleep better, etc. Itprovides spectral transmittance data for most of blue light filtering eyewear(whenever publicly available).