Computer eye strain (eye fatigue, computer vision syndrome) has also been associated with blue light emitted by digital display devices. Computer eye strain is a big problem if you are blue light sensitive and you need to stare at screens a lot (my case). Moreover, emerging research suggests that there are other longer term health hazards, e.g. retina damage, sleep disorder, depression, etc. Blue light filters are a possible solution to blue light induced computer eye strain. This post attempts to answer the following questions: How does blue light cause computer eye strain? What blue light filter options are there? How effectively do they filter blue light? Where can you get them?


DisclaimerThis is a summary of a non-expert’s (me) research on blue light and blue light filter effectiveness in relieving computer eye strain. I am more sensitive to blue light – hence my research on blue light and blue light filters. I hope this overview helps you in your research. If you discover or already know something different to what is said below, please, do write about it in comments for the benefit of other readers.

Disclosure: I would like you to know that I earn a commission (at no additional cost to you) if you use some of the links below to purchase a product. If you wish to support GLARminY, use the links containing text: Disclosure: commission link or use this link (Disclosure: commission link) to shop on Amazon at any other time.


 

What causes eye strain

Intense use of the eyes is the cause of eye strain in a person with normal vision. Activities that likely cause eye strain are extended periods of driving, reading, writing, sewing, computer use… Eye strain may be worsened when using the eyes intensely under certain conditions such as exposure to glare (contrast in brightness), or by straining to see in low light conditions. Eye strain may also be aggravated by some special condition such as greater sensitivity to light, glare sensitivity or blue light sensitivity.

Eye strain symptoms include one or more of the following: a sensation of strain in the area around or between the eyes, dry or red eyes, blurred vision, headaches, back pain, neck pain, and general fatigue.

Computer eye strain symptoms

 

Computer eye strain

If one were to look for the best commonly used device most likely to cause eye strain, computer is a likely winner.

computer eye strain results from heavy computer use

Computers require intense use of the eyes, often for extended periods of time. Moreover computer screens (most digital screens) are sources of light, they are prone to glare and reflections, and they emit High Energy Visible (HEV) blue light with high intensity (E-readers using E-Ink technology – not backlit – are an exception).

 

computer eye strain causes - blue light emissions by digital device

This is but one example. Blue light intensity may be lower or greater but id does tend to be greater in relation to longer wavelengths intensity when compared to natural light sources (sun, moon, fire). Source: PFO Global

 

How blue light causes computer eye strain

Visible light in the violet and blue areas of the spectrum (shorter wavelengths ~380-500nm) is not as easily focused as longer wavelengths due to greater scattering and aberrations. Moreover, these phenomena lead to glare disability and discomfort glare at lower light intensity levels (The visual effects of intraocular colored filters; 2012). When abundant (as in the case of digital displays) violet and blue light may reduce contrast making things appear hazy, glary and out of focus. Our eyes’ futile struggle to focus eventually causes computer eye strain. When violet and blue light is filtered out, contrast is improved, the eye finds it easier to see detail and computer eye strain is relieved (Contrast Is Enhanced by Yellow Lenses Because of Selective Reduction of Short-Wavelength Light; 2000).

 

Blue light sensitivity

Blue light sensitivity is to a great extent still an enigma. There are three types of photo receptors whose sensitivity peaks in the blue light area of the spectrum:

The ipRGCs were discovered relatively recently in 2002. More recent still is the discovery of the number of functions attributed to ipRGCs encompassing a range of sub-conscious and reflex light responses (Mammalian inner retinal photoreception; 2013). In addition to being photosensitive ipRGCs also receive and combine a signal from other photoreceptors (with different spectral sensitivities) to produce an integrated non-visual signal that is sent to our brain. The relative contribution of each photoreceptor to evoked responses is not fully understood (Measuring and using light in the melanopsin age; 2014).

The fact that research on the health benefits and hazards of blue light is in the early stages (Mammalian inner retinal photoreception; 2013) could be the reason for the disagreement on what specific frequency or frequencies of light to attenuate or increase (depending on the desired effect) and by how much. For example, each eyewear lens manufacturer has a different interpretation of blue light. Subsequently, the way they choose to manage blue light filtering to reduce computer eye strain and/or sleep disorder varies significantly. There is, however a general agreement, that the potentially dangerous wavelengths are in the range between ~400 and ~500nm, namely the violet/blue light range (although some reports do go as low as ~380nm – violet – and as high as ~550nm – green).

In addition blue light sensitivity tends to be importantly affected by one’s macular pigment optical density MPOD, which varies considerably from person to person – macular pigment is our intra-ocular blue light filter that may filter more or less blue light depending on its optical density (Enhancing performance while avoiding damage: A contribution of macular pigment; 2013).

 

Should you always try to block 100% of blue light

blue light – daylight spectrograms 1Blue light is not bad. People have always been exposed to blue light emitted by the Sun. Our body needs and uses blue light’s oscillating intensity (high during the day and low or none at night) to regulate various physiological processes and function properly.

Blue light has become a health hazard relatively recently, with the advent of artificial lighting which has prolonged the time of our daily exposure to blue light (The dark side of light at night: physiological, epidemiological, and ecological consequences; 2007). Ancient night light sources – fire/candlelight and even incandescent light bulbs – emit nearly no blue light (see below).

blue light hazard – oled – spectrograms by type of light source

Particularly disruptive has been the recent widespread adoption of digital screen devices backlit with Light Emitting Diodes (LEDs) which emit blue light with particularly high intensity. The good news is that a new lighting technology called Organic Light Emitting Diode (OLED) is coming out. It is still expensive, but certain types of OLEDs may emit blue light of similarly low intensity as candles.

Therefore, most people should only worry about blue light exposure in the evenings (2-3 hours before bed time), when reduced blue light intensity should signal our bodies to start getting ready for the necessary sleep. The more blue light sensitive might also have to consider reducing blue light exposure in daytime to avoid other health hazards and/or blue light induced computer eye strain.

There is a subtle difference between blue light induced insomnia and eye strain. You can read about it in How to pick the best blue filter for your light sensitivity problem. You’ll learn about which wavelengths your blue light filter should absorb/block, by how much, how to compare bluelight filters, etc.

 

How can you know if your computer eye strain might be associated with blue light

It seems reasonable to assume that blue light sensitivity is also normally distributed. Although I haven’t found any information on this subject, it is possible to note – from the comments to blue light related articles, and by observing others  – that there are a few people who are particularly sensitive to blue light, other few who don’t seem to be affected much, and the majority somewhere in between these two extremes. If you are experiencing computer eye strain and you have already eliminated other possible causes, such as for example glare and reflections on your screen, you might be among the more light sensitive.

 

Use a free blue light filter app to check if you might be blue light sensitive

The post Are your eyes sensitive to light … or just blue light explains how you can do it.

You can also test your eyes with our blue light filter Tester with 8 interchangeable filters that block different proportions of blue light:

Blue light filter Tester S

 

How sensitive are you to blue light

To figure out just how sensitive you are to computer eye strain-causing blue light , you can try filtering greater and greater proportions of blue light until you feel relieved from computer eye strain. I recommend you to start with blue light filters that are free (for example start by installing a blue light filter app, then you can change your text and background color in addition to running the blue light filter app …).

 

The 10 blue light filters

Below you may find a list of blue light filters divided in two sections: software solutions and physical blue light filters. If you find the choices and the spectral transmission data information overwhelming consider reading first the post: How to pick the best blue filter for your light sensitivity problem.

A good software blue light filtering solution may provide superior viewing comfort than a physical filter by preserving contrast better. A physical blue light filter always reduces contrast. It also produces internal and surface reflections of light, even when it includes an anti reflective (AR) coating.

The blue light filter list includes only those products or tricks where some reference to how much blue light they filter is available – links to information sources are provided.

Note that if blue light is filtered (even slightly) the result is inevitably color distortion. The more blue light is filtered the more it affects color. Colors that get affected more are those with higher blue content.

 


(0) Improve your own, natural blue light filter: macular pigment and blue light filtering diet

The post Less light sensitivity, computer eye strain: BlueLight filtering diet summarizes my recent discovery of the research on macular pigment, its blue light filtering function and the huge intrapersonal variability in its blue light filtering capacity principally due to sub-optimal diet.

Since macular pigment is far superior than any other blue light filter on many accounts, I felt I should add it to this list.

See article on best eye supplements containing all three macular pigment carotenoids – lutein, zeaxanthin, and meso-zeaxanthin.

You may buy them at Amazon:  US/Canada-based readers (Disclosure: commission link)UK/EU-based readers (Disclosure: commission link).


 

Software blue light “filtering” solutions

Strictly speaking software solutions do not filter blue light. Instead they reduce screen’s blue light emissions by altering slightly the colors displayed by your digital screen, such that the colder colors – white, blue, green – are changed with warmer colors – yellow-ish, orange-ish, red-ish.

 

(1) Blue light filter apps

Preserving contrast is a very important feature/advantage of a blue light filtering app because low contrast reduces readability thus causing computer eye strain.

There are two different approaches used by blue light filtering apps: Color transform approach is superior because the alternative, transparent overlay, reduces contrast far more.

You may easily recognize which approach an app is using by looking at what it does to black color. Color transform leaves it unchanged because black has the lowest possible blue light content. Overlay approach, on the other hand, makes black look lighter (usually yellowish or reddish) thus reducing the contrast between black and other colors unnecessarily.

There are two blue light filter apps that use color transform approach:

  • f.lux – designed principally to help with blue light induced insomnia
  • Iris (commission link) – designed to prevent computer eye strain (and insomnia)

Essentially they both do the same thing – i.e. reduce the amount of blue light emitted by your screen. Therefore they may both be used for both eye strain and insomnia. However, there are some differences such that if your principal goal is to avoid computer eye strain you might find Iris more suitable. In terms of preventing insomnia they are very similar (for a full review see Best blue light filter apps for visual comfort: Iris & f.lux).

 

Iris’ (commission link) basic app, Iris Mini, is free. But it only lets you lower blue light emissions to the level equivalent to a correlated color temperature to 3400K. That is enough to get a feel for the app or if you just want to reduce blue light emissions of your screen as a preventive measure. However, if you are experiencing blue light induced computer eye strain or insomina you should probably get Iris Mini Pro ($2) or even Iris Pro ($10).

Iris is minimalistic and very easy to use.

One thing I like about Iris (as compared to f.lux) is its Manual setting that lets you set blue light filtering capacity of the app constant day and night.

The pre-set options of Correlated Color Temperature range from 1200K to 6500K (see below).

iris-mini-pro-blue-light-filtering-app-manual-mode

In addition its hidden features allow you to set any correlated color temperature you want all the way down to zero (0) K.

Another very useful option might be the invert feature, which inverts all the colors on your screen.

Unfortunately I haven’t been able to find spectral power distribution (SPD) of the different settings but Iris does seem able to lower blue light emissions as far as your screen will let you. Moreover SPD under different correlated color temperature settings are probably similar to those of f.lux (see below).

Iris is available for Windows, Mac, and Linux. It is also available for Android (but it uses transparent overlay approach, not color transform :(.


 

f.lux software is free and probably the best known and most used blue light filtering app. It may reduce blue light intensity by up to 94-98% (at 1200K lighting setting – source: f.luxometer).

f.lux’s blue light “filtering” capacity will depend principally on how you set it up. The reduction of blue light intensity is greater at lower lighting setting (monitor showing warmer colors) and vice versa. In the images below (borrowed from f.luxometer) the change in background color gives a rough idea of how much white color is distorted given the amount of blue light filtered.

Blue light filter app efficiency NO FLux Spectrographic analysis Blue light filter app efficiency FLux at 2700K Spectrographic analysis Blue light filter app efficiency FLux at 1200K Spectrographic analysis

Images: (1) F.lux filter OFF, (2) 2700K setting (70-80% of blue light filtered), and (3) 1200K setting (94-98% blue light filtered). If you use f.lux default settings your screen will look like image (1) during the day (no f.lux) and look closer to image (2) at the beginning/end of the day and at night. (Klick on images to see more detail).

f.lux is available for Windows, Mac, Linux, and iPhone/iPad and Android.

 

(2) Change text and background color to filter blue light

Changing text and especially background color is a free and easy DIY version of a (color transform) blue light filter app. Changing background and text color is a good option if you mostly read of the screen, edit text or work with spreadsheets. You can select the colors you want and control the contrast level, which may not be the best if you don’t know what you are doing.

Depending on your background/text color choice and digital screen model it may “filter” up to 75-95% of blue light as compared to black text on white background (estimates based on LEDMuseum and f.luxometer data).

Blue light intensity reduction cannot be 100% for two reasons. First, most monitors emit blue light even when displaying those colors that in theory do not contain blue light, i.e. red and black (see the spectrograms of screens displaying red – unfortunately I could not find black screen data, but assumed that its blue light content is similar/lower to that of a red screen). Second, when you change background color to black, you might filter blue light by close to 100%. But there remain some smaller, often bright, parts of the screen (icons, scroll bars, window borders, images …) the color of which one cannot change.

You may find detailed instructions on how to change background color and text color in Windows 7, Adobe Acrobat, Firefox, Chrome, etc… in the post 10 ways to change background color and reduce screen brightness. Windows 10 users see this post.

Choosing background color well is key to reducing blue light emissions of your digital screen. The post Background color least likely to cause eye strain his post might help you find your ideal color.

If necessary you can filter even more blue light by changing background/text colors and running a blue light filter app simultaneously – section (1) above. Both blue light “filters” together should enable you to filter close to 100% of blue light.

 

Physical blue light filters

As commented, a major drawback to physical blue light filters is that they always reduce contrast, however, this doesn’t seem to bother everyone. Contrast reduction is significantly lower with filters/lenses that have an Anti Reflective (AR) coating.

Best blue light filtering eye glasses may be the most effective solution to blue light induced eye strain for those who would like to filter not only blue light from their digital screens, but also blue light from other light sources, for example harsh office lighting.

Blue light filtering capacity of physical filters depends principally on filter’s tint color and its darkness. The most common blue light filtering tints are yellow (amber), orange and red. Red tinted filters block all blue and also some green light (up to ~550nm) but seem not to be used/recommended as blue light filters due to the lowest overall light transmission (~20-25%) and greatest color distortion. Filters tinted yellow block the least blue light (frequencies up to ~400-450nm) but provide greatest overall light transmission (~90-96%). Orange filters are somewhere in between. They may filter all blue light up to ~500-550nm with ~30-69% overall light transmission. Sources: Cocoons Eyeware, Uvex (pdf: 798KB), Rosco, BPI, and f.luxometer. (If interested you can experiment with different filter tints to see effects on blue light filtering capacity and overall light transmission here).

I recommend you check out vendor’s return policy before ordering a blue light filter you haven’t used before. You can’t really know if it will work until you try it.

 

(3) Tinted protective glasses as a blue light filter

Tinted protective eyewear is a relatively cheap (under $10) and durable solution that may filter up to 100% of blue light. (It is not ideal for tasks that require fine vision, like reading, sowing, etc…, because they generally don’t have AR (anti-reflective) coatings – hence they optically distort the image more than better/pricier eyewear and make your eyes strain more.

 

Uvex S1933X Skyper Safety Eyewear SCT-Orange UV Extreme Anti-Fog is an option if you would like to filter blue light completely (nearly) while maintaining a reasonable overall light transmission:

Uvex S1933X Skyper Safety Eyewear as Blue light filter SCT-Orange UV Extreme Anti-Fog

  • blue light filtered >= 98%
  • overall light transmission: 45%
  • UV Absorption >= 99.9%

Sources: Uvex (pdf: 798KB), f.luxometer

UVEX SCT-Orange blue light filter efficiency Spectral data by manufacturer

UVEX SCT-Orange blue light filter efficiency Spectral data by fluxometer

You may buy Uvex S1933X Skyper SCT-Orange Safety Eyewear from Amazon (Disclosure: commission link) – note Customer reviews – or eBay (no commission link).

I own these. I don’t use them to relieve computer eye strain – in my case that is taken care of by text/background settings and f.lux. Instead I wear them in the evenings (after 6/7pm) under natural (summer) or artificial lighting. They help me sleep better and longer. They are great.


 

Uvex S3522 Genesis X2 Safety Eyewear Amber Lens is an option if you would like very good general light transmission and sharper image due to reasonable blue light filtering capacity. User comments show that they are being used to relieve computer eyestrain and improve sleep:

Uvex S3522 Genesis X2 Safety Eyewear Amber Lens

  • blue light filtered ~55%
  • overall light transmission: 90%
  • UV Absorption >= 99.9%

Source: Uvex (pdf: 798KB)

UVEX Amber lens blue light filter efficiency Spectral data by manufacturer

You may purchase Uvex S3522 Genesis X2 Amber Lens Safety Eyewear from Amazon (Disclosure: commission link) or eBay (no commission link).

UVEX amber lens is available in various frame designs. If you would like to see other options use the above links to go to Amazon or E-bay and search UVEX AMBER LENS.


 

3M Yellow/Amber Lens Safety Glasses is another alternative with very good general light transmission and sharper image due to reasonable light filtering capacity:

3M Yellow-Amber Lens Safety Glasses

  • blue light filtered ~53%
  • overall light transmission: ~85-92%,
  • UV absorption: excellent

Sources: 3M, f.luxometer

3M Yellow-Amber Lens Safety Glasses blue light filter efficeincy Spectral data

You may purchase 3M Yellow-Amber Lens Safety Glasses from Amazon (Disclosure: commission link) or eBay (no commission link).

3M Yellow-Amber lens is available in different frame stiles. If you would like to find an alternative to the one displayed above use the above links to go to your favorite store and search 3M YELLOW-AMBER LENS SAFETY GLASSES.


 

(4) Special purpose blue light filtering eyewear

If you would like more style options and high quality, you might consider glasses made specifically to filter blue light. See also post Best blue blockers in style and light filter specs.

Axon Optics with FL-41 lens tint. FL-41 tint was designed initially for fluorescent light sensitivity and is known to alleviate Migraine and some Benign Essential Blepharospasm symptoms (Diagnosis, Pathophysiology, and Treatment of Photophobia; 2016). It takes out about 50% of blue light with minimal color distortion.

Disclosure: I’ve tested a pair, courtesy of Axon Optics: The glasses are very high quality. For me other blue light filters appear more suitable, which, however, doesn’t mean you shouldn’t try FL-41 tint. I don’t suffer from Migraines nor Blepharospasm, and there is much praise by happy customers out there.

Axon Optics FL-41 indoor lens tint spectral transmission

  • blue light filtered: ~50% (indoor lens)
  • overall light transmission: ~60% (indoor lens), ~20% (outdoor)
  • UV absorption: 100%

Sources: Axon Optics (private communication), f.luxometer

You may purchase Axon Optics FL-41 glasses and contact lenses from Axon Optics (Disclosure: commission link). Several frame models available. You can also send in your own frame and have regular or prescription Rx FL-41 tint lenses fitted.


 

TheraSpecs is another internet company that offers quality FL-41 tint on their migraine relief and fluorescent light sensitivity eyeglasses (Diagnosis, Pathophysiology, and Treatment of Photophobia; 2016).

theraspecs-fl-41-indoor-lens-tint-spectral-transmission

  • blue light filtered: ~70% (indoor lens – estimate from the image)
  • overall light transmission: ~43% (indoor lens)
  • UV absorption: 100%

You can buy from TheraSpecs on Amazon (commission link) or directly: TheraSpecs online shop (non-commission link).


 

BluBlockers offer various designs. To filter blue light the lens should be orange-ish. Since BluBlockers are marketed as sunglasses they are characterized by relatively low overall light transmission.

BluBlocker Viper blue light filtering sunglasses

  • blue light filtered ~100%
  • overall light transmission: ~23%,
  • UV absorption: 100%

Sources: BluBlocker Corporation, f.luxometer

 

BluBlocker blue light filter efficiency Spectral data by fluxometer

You may purchase BluBlocker sunglasses from Amazon (Disclosure: commission link), eBay (no commission link) or directly from BluBlocker (no commission link) where you can also view all their models.


 

LowBlueLights.com is another company that offers various designs of blue light filtering glasses (and fitovers). LowBlueLights lenses offer the highest overall light transmission at 100% blue light filtering capacity!

LowBlueLights.com blue light filtering glassesLowBlueLights.com blue light filtering glasses

  • blue light filtered ~100%
  • overall light transmission: ~69%,
  • UV absorption: data not available; polycarbonate lens should absorb 100%

Sources: LowBlueLights.com, f.luxometer, CET

LowBlueLights.com blue light filter efficiency Spectral data by fluxometerdriver fatigue and eye strain_LowBlueLights spectral transmission curves

You may only purchase blue light filtering glasses directly from LowBlueLights.com (no commission link).


 

(5) Blue blocking screens and Color film as a blue light filter

[Update:] See this article for a comprehensive list of 13 brands of blue light screen filters/protectors/covers. The list includes spectral transmission specification (where available) and use recommendations.

Best blue light screen protectors

 

Another cheap (under $10) DIY version of a blue light filter is to put a color film (filter gel) over your digital screen. The proportion of blue light filtered depends on the color chosen. Yellow filters ~50% and provides high overall light transmission. Red filters near 100% of blue light, but allows much less light to go through. Orange is somewhere in between.

A color film can be taped to your screen’s frame (after being cut to the right size). If you tape it only at the top you will be able to flip it behind your screen when you don’t need to have blue light filtered.

 

Rosco theater/photography color film as a blue light filter

roscolux filter gels as blue light filter

Below you may find spectral data for four different tints of Rosco film, which may be of highest interest in terms of the tradeoff between blue light filtering capacity and overall light transmission (more colors/data at Rosco and Rosco’s myColor web app).

Rosco Medium Yellow R10 as blue light filter spectral data

Rosco Orange R23 as blue light filter spectral data

Rosco Deep Amber R22 as blue light filter spectral data

Rosco Fire R19 as blue light filter spectral data

Rosco’s filter gels may be purchased from Amazon (Disclosure: commission links):


 

(6) Special purpose computer eyewear as a blue light filter

Computer glasses are dedicated glasses for computer work or gaming. They cater to specific needs of computer use with the aim of preventing computer eye strain. Most computer glasses also filter blue light and are, hence, tinted yellow. Yellow lens provides high general light transmission level and low color distortion while filtering blue light at a reasonable level (sufficient for many people).

 

Gunnars (amber lenses): a reasonable blue light filter, excellent overall light transmission, and a wide variety of models:

Gunnar PPK blue light filter computer glasses

  • blue light filtered: ~ 50%
  • overall light transmission: 96%
  • UV absorption >= 99.9%

Sources: Zeiss/Gunnar, f.luxometer

Computer glasses GUNNARS iONiK lens tint by Carl Zeiss Vision blue light filtering capacity

Gunnar amber lens blue light filter efficiency Spectral data by manufacturer

You may purchase Gunnars from Amazon (Disclosure: commission link), eBay (no commission link) or directly from Gunnar Optiks (commission link).


 

EyeFatigue computer glasses (and reading glasses) have Anti-Reflective (AR) coating with slight green tint that blocks some blue light. They are more reasonably priced.

EyeFatigue computer glasses  EyeFatigue lens transmittance

  • blue light filtered: ~ 15% (estimate based on above graph)
  • overall visual light transmission: ~90% (estimate based on above graph)
  • UV absorption >= 99.9%

Sources: EyeFatigue (private communication)

You may purchase EyeFatigue computer glasses with diopter add from EyeFatigue (no commission link).


 

For more options of computer eyewear see the post on best blue blockers.

best-blue-blockers


 

Blue light filter solutions for those who wear prescription glasses

If you wear prescription eyeglasses you can use most of the blue light filters mentioned above. Tinted protective eyewear is an exception as it doesn’t fit over your prescription glasses, but there are fitover and clip-on flip-up alternatives which you can find below. You might also consider prescription computer glasses or prescription glasses with special, blue light filtering lenses.

 

(7) Prescription eyeglasses with blue light filtering lenses

Reading Glasses ETC offers seven different blue blocking tints and over 1000 frame styles.

In addition to the spectrograms (see images below) they disclose percentages of blue light filtered (over 400-550nm range!).

Their blue blocking lenses are available as plano/zero power, reading powers, or single vision prescription either with Anti-Reflective (AR) coating or tinted.

You may buy prescription glasses from Reading Glasses ETC (commission link). See also their budget blue blockers for $29 (commission link).

5% discount for 1st time customers – promo code: RGEMOJO5 with the link above. [update Oct 27, 2016]

 

You may also buy prescription blue light filtering glasses online from EyeFatigue (no commission link), or Gunnar Optiks (commission link) – see spectral transmission data in the previous section (6).


 

(8) Fitovers that filter blue light

Uvex fitovers with orange lens are an inexpensive (under $10) option if you would like to filter blue light completely while maintaining a reasonable overall light transmission:

Uvex Fit Over Safety Eyewear as Blue light filter SCT-Orange lens

  • blue light filtered >= 98%
  • overall light transmission: 45%
  • UV absorption >= 99.9%

Source: Uvex (pdf: 798KB), f.luxometer

 

UVEX SCT-Orange blue light filter efficiency Spectral data by manufacturer

UVEX SCT-Orange blue light filter efficiency Spectral data by fluxometer

You may buy Uvex Fit Over Orange Safety Eyewear from Amazon (Disclosure: commission link) or eBay (no commission link).


 

Cocoons fitovers with yellow (lemon) lens is an option if you would like to moderately filter blue light while maintaining a reasonable overall light transmission (available in various designs and sizes):

Cocoons fitovers yellow lens as blue light filter

  • blue light filtered 40% (100% up to 470nm)
  • overall light transmission: 86%
  • UV absorption: 100%

Source: Cocoons

You may buy these Cocoons fitovers with yellow (lemon) lens of various shapes and sizes (see sizing guide) from Amazon (Disclosure: commission link), eBay (no commission link) or Cocoons eyeware (no commission link).

Cocoons fitovers are available also with orange lens (blue light filtered 100% up to 520nm and overall light transmission 34%) – go to your favorite store through the links above and search COCOONS LOW VISION FITOVERS ORANGE.


 

(9) Tinted clip-on flip-up lenses as blue light filter

Cocoons SideKick clip-on flip ups with orange lens is an option if you would like to filter blue light completely:

Cocoons SideKicks clip-on orange lens blue light filter

  • blue light filtered 100% (up to 520nm)
  • overall light transmission: 34%
  • UV absorption: 100%

Source: Cocoons

You may buy orange Cocoons SideKick clip-on flip ups in three sizes (M, L, XL – see sizing guide) from Amazon (Disclosure: commission link), eBay (no commission link) or from Cocoons directly (no commission link).


 

Cocoons SideKick clip-on flip ups with yellow (lemon) lens is an option if you would like to filter blue light moderately while maintaining a good overall light transmission:

Cocoons SideKicks clip-on yellow-lemon lens blue light filter

  • blue light filtered 40% (100% up to 470nm)
  • overall light transmission: 86%
  • UV absorption: 100%

Source: Cocoons

You may buy yellow Cocoons SideKick clip-on flip ups in three sizes (M, L, XL – see sizing guide) from Amazon (Disclosure: commission link), eBay (no commission link), or from Cocoons directly (no commission link).


 

(10) Prescription computer glasses with blue light filtering lenses

Gunnars Prescription Rx (amber lenses) are available through Gunnar Optiks (commission link). You may choose from a wide variety of frame styles.

See section (6) Special purpose computer eyewear as a blue light filter above for more information on blue light filtering capacity (~53%) and general light transmission (96%) of Gunnars’ amber lens.

More reasonably priced computer glasses are also available from Reading Glasses ETC (Disclosure: commission link) and EyeFatigue (no commission link). For the latter see spectral transmittance information in section (6) above.


 

How to find the ideal blue light filter for your eyes

If you feel overwhelmed by all the spectrograms and the many choices you might consider our blue light filter Tester that has been designed to help you find your optimal blue light filter.

Blue light filter Tester S

 

Ps: If you found this post 10 blue light filters to relieve computer eye strain, help sleep better, etc. useful, please consider LIKING, REBLOGGING, and/or SHARING it below.

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