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How to Test Blue Light Glasses Download ArticleExplore this Article Sections 1 What is blue light? 2 Is blue light harmful? 3 Which blue light lenses are most effective? 4 RGB Color Chart Test 5 Black and Blue Square Test 6 Lens Reflection Test + Show 3 more... - Show less... Other Sections Tips and Warnings Related Articles References Co-authored by Kara Hartl, MD, FACS and Madeleine Criglow
Last Updated: April 5, 2025 Fact Checked
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This article was co-authored by Kara Hartl, MD, FACS and by wikiHow staff writer, Madeleine Criglow. Dr. Kara Hartl is a board certified Ophthalmologist and the Founder and CEO of Mountain View Eye Center in Fairbanks, Alaska. Dr. Hartl is a blue light expert and specializes in studying the effects of natural and artificial light on people’s eyes and bodies. She received a BA in Biology from Harvard University and earned her Doctor of Medicine (MD) from The University of California-San Diego Medical School. Dr. Hartl also trained at the world-renowned Bascom Palmer Eye Institute. She is passionate about incorporating technology into the future of eye care and has started a public education initiative to inform everyday LED screen users about the effects and the easy ways to protect themselves while continuing to use their devices. Dr. Hartl also founded the international non-profit, Gift of Sight, which is dedicated to curing blindness across the globe. There are 8 references cited in this article, which can be found at the bottom of the page. This article has been fact-checked, ensuring the accuracy of any cited facts and confirming the authority of its sources. This article has been viewed 57,708 times.
Blue light glasses can be a great way to protect your eyes and get good rest at night, but not all pairs are equally effective. If you want to test the effectiveness of your blue light glasses or are curious about learning more before you buy a pair, this article is here to help. Read on to learn all the ways you can test your blue light glasses at home. We'll also walk you through the different types of blue light glasses available so that you can find a pair that gives you the kind of protection you're looking for.[1]XResearch source
Steps
Section 1 of 6:
What is blue light?
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Blue light is a color on the visual light spectrum. The human eye can see all the colors of the visual light spectrum (which are also referred to as wavelengths), including blue, red, and green. Blue light is visible in sunlight and on the screens of electronic devices.[2]X Trustworthy Source American Academy of OpthamologistsProfessional medical organization focused on advocating for public health and supporting sight-related research Go to source
Advertisement Section 2 of 6:
Is blue light harmful?
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Too much blue light can have a negative impact on your sleep cycle. If you're exposed to an excess amount of blue light, it can disrupt your body's production of the sleep hormone melatonin and alter your circadian rhythm.[3]X Expert Source Kara Hartl, MD, FACSBoard Certified OphthalmologistExpert Interview Because of its effects, ophthalmologists often recommend limiting your screen time to cut back on your blue light exposure (especially before bedtime).[4]X Trustworthy Source Cleveland ClinicEducational website from one of the world's leading hospitals Go to source
Not all exposure to blue light is bad. Blue light from the sun, for example, helps you feel more awake in the morning. The main culprit is the blue light emitted from LED screens, especially at night.[5]X Expert Source Kara Hartl, MD, FACSBoard Certified OphthalmologistExpert Interview
Section 3 of 6:
Which blue light lenses are most effective?
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1 Clear lenses block less blue light, but are great for everyday use. Clear lenses are the most popular models of blue light glasses, since they have no tint and look like regular glasses. Though they are not as effective as amber or orange-tinted lenses, some studies have shown that they can still reduce the harmful effects of blue light on your eyes. They are often used to prevent eyestrain in people who work from home or stare at a screen all day.[6]X Trustworthy Source PLOS ONEOnline peer-reviewed, open access scientific research journal Go to source They are also great for people that don't want to distort their color perception when using screens.[7]X Expert Source Kara Hartl, MD, FACSBoard Certified OphthalmologistExpert Interview
2 Amber or orange-tinted lenses are able to block more blue light. The range of blue light that these models block varies as well, but some studies have shown that they're able to increase the amount of protection your eyes get.[8]X Expert Source Kara Hartl, MD, FACSBoard Certified OphthalmologistExpert Interview Orange and amber-tinted glasses are often used by gamers or others who use screens at night, as the increased protection can help prevent blue light exposure from negatively impacting your sleep.[9]XResearch source
It's best not to wear orange-tinted lenses when you're not actively staring at a screen.[10]X Expert Source Kara Hartl, MD, FACSBoard Certified OphthalmologistExpert Interview As they significantly alter your color perception, they can negatively affect your vision when you're doing other things, like driving.
Advertisement Section 4 of 6:
RGB Color Chart Test
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1 Look at the RGB color chart without your glasses first. RGB stands for "Red, Green, Blue." To find the RGB color chart image, search "RGB Color Chart" or "RGB Color Wheel" online. While looking at the color chart without glasses, you will see a red section, a green section, and a blue section. In the areas in which green and blue intersect, you will also see a smaller light blue (cyan) section.
2 Put on your glasses and stare into the RGB color chart. If your glasses are blocking blue light, the blue section will appear much darker than before (dark blue, dark grey, or black). The light blue (cyan) section will blend in with the green section, which will also be significantly darker. If this is what you see, that means your glasses are effectively blocking at least some blue light.[11]XResearch source
If there isn't a significant change, it's possible your glasses may not be blocking blue light.
Advertisement Section 5 of 6:
Black and Blue Square Test
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1 Stare into the black and blue squares without your glasses first. To find the black and blue square test online, search "Black and Blue Square Test" to pull up the image. When you're not wearing your glasses, you should see one black square and one blue square.
Alternatively, sometimes this test is done as a blue and black circle. If so, search "Blue and Black Circle Test" to find a black circle with a blue inner circle inside.
2 Look into the blue and black squares with your glasses on. If your glasses are blocking blue light, you should now see two black squares. If that's what you see, your glasses are blocking at least some blue light.
In the case of the blue and black circle test, you will now see one black circle (with no inner blue circle).[12]XResearch source
If you still see blue and black squares or a blue and black circle, your glasses may not be super effective at blocking blue light.
Advertisement Section 6 of 6:
Lens Reflection Test
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Put on your glasses and notice the colors reflecting off the lenses. This method is not 100% accurate, but it can still give you a general idea of whether your glasses are blocking blue light. Simply put on your glasses and look into the lenses to see if you notice what color is reflecting off of them. If you see a blue tint, it means that your glasses are likely protecting you from blue light.
If the color reflecting off your glasses is purple or violet, they may not be protecting you from blue light.
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Tips
For the most accurate look at how effective your glasses are, contact the company that made them for an official spectral analysis report. A trustworthy company will be able to provide this data.[13]XResearch sourceThanks Helpful 0 Not Helpful 0
Rather than using blue light glasses, the American Academy of Ophthalmology recommends decreasing your screen time, especially at night, to lessen the negative impact it may have on your sleep and eye health.[14]X Trustworthy Source American Academy of OpthamologistsProfessional medical organization focused on advocating for public health and supporting sight-related research Go to source Thanks Helpful 0 Not Helpful 0
At-home tests provide a helpful estimate of how effective your blue light glasses are, but it's important to remember that they aren't always 100% accurate. Thanks Helpful 0 Not Helpful 0
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Warnings
Be wary of any company selling a laser testing pen to test their blue light glasses. These pens are meant for detecting ultraviolet light only and do nothing to test blue light. Thanks Helpful 4 Not Helpful 1
At this time, blue light glasses are not considered medical devices and are not regulated by the FDA. This means that it may be difficult to determine with 100% certainty how effective or beneficial your blue light glasses are.[15]X Trustworthy Source Consumer ReportsNonprofit organization dedicated to consumer advocacy and product testing Go to source Thanks Helpful 0 Not Helpful 0
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Co-authored by: Kara Hartl, MD, FACS Board Certified Ophthalmologist This article was co-authored by Kara Hartl, MD, FACS and by wikiHow staff writer, Madeleine Criglow. Dr. Kara Hartl is a board certified Ophthalmologist and the Founder and CEO of Mountain View Eye Center in Fairbanks, Alaska. Dr. Hartl is a blue light expert and specializes in studying the effects of natural and artificial light on people’s eyes and bodies. She received a BA in Biology from Harvard University and earned her Doctor of Medicine (MD) from The University of California-San Diego Medical School. Dr. Hartl also trained at the world-renowned Bascom Palmer Eye Institute. She is passionate about incorporating technology into the future of eye care and has started a public education initiative to inform everyday LED screen users about the effects and the easy ways to protect themselves while continuing to use their devices. Dr. Hartl also founded the international non-profit, Gift of Sight, which is dedicated to curing blindness across the globe. This article has been viewed 57,708 times. 15 votes - 60% Co-authors: 4Updated: April 5, 2025 Views: 57,708 Categories: Eyeglasses
Medical Disclaimer
The content of this article is not intended to be a substitute for professional medical advice, examination, diagnosis, or treatment. You should always contact your doctor or other qualified healthcare professional before starting, changing, or stopping any kind of health treatment.
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Download Article Explore this Article Sections 1 What is blue light? 2 Is blue light harmful? 3 Which blue light lenses are most effective? 4 RGB Color Chart Test 5 Black and Blue Square Test 6 Lens Reflection Test + Show 3 more... - Show less... Other Sections Tips and Warnings Related Articles References Co-authored by Kara Hartl, MD, FACS and Madeleine Criglow 
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Co-authored by: Kara Hartl, MD, FACS Board Certified Ophthalmologist This article was co-authored by Kara Hartl, MD, FACS and by wikiHow staff writer, Madeleine Criglow. Dr. Kara Hartl is a board certified Ophthalmologist and the Founder and CEO of Mountain View Eye Center in Fairbanks, Alaska. Dr. Hartl is a blue light expert and specializes in studying the effects of natural and artificial light on people’s eyes and bodies. She received a BA in Biology from Harvard University and earned her Doctor of Medicine (MD) from The University of California-San Diego Medical School. Dr. Hartl also trained at the world-renowned Bascom Palmer Eye Institute. She is passionate about incorporating technology into the future of eye care and has started a public education initiative to inform everyday LED screen users about the effects and the easy ways to protect themselves while continuing to use their devices. Dr. Hartl also founded the international non-profit, Gift of Sight, which is dedicated to curing blindness across the globe. This article has been viewed 57,708 times. 15 votes - 60% Co-authors: 4 Updated: April 5, 2025 Views: 57,708 Categories: Eyeglasses 
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Blue light is a color on the visual light spectrum. The human eye can see all the colors of the visual light spectrum (which are also referred to as wavelengths), including blue, red, and green. Blue light is visible in sunlight and on the screens of electronic devices.[2] Advertisement 
Too much blue light can have a negative impact on your sleep cycle. If you're exposed to an excess amount of blue light, it can disrupt your body's production of the sleep hormone melatonin and alter your circadian rhythm.[3] Because of its effects, ophthalmologists often recommend limiting your screen time to cut back on your blue light exposure (especially before bedtime).[4] 
1 Clear lenses block less blue light, but are great for everyday use. Clear lenses are the most popular models of blue light glasses, since they have no tint and look like regular glasses. Though they are not as effective as amber or orange-tinted lenses, some studies have shown that they can still reduce the harmful effects of blue light on your eyes. They are often used to prevent eyestrain in people who work from home or stare at a screen all day.[6] They are also great for people that don't want to distort their color perception when using screens.[7] 
2 Amber or orange-tinted lenses are able to block more blue light. The range of blue light that these models block varies as well, but some studies have shown that they're able to increase the amount of protection your eyes get.[8] Orange and amber-tinted glasses are often used by gamers or others who use screens at night, as the increased protection can help prevent blue light exposure from negatively impacting your sleep.[9] 
1 Look at the RGB color chart without your glasses first. RGB stands for "Red, Green, Blue." To find the RGB color chart image, search "RGB Color Chart" or "RGB Color Wheel" online. While looking at the color chart without glasses, you will see a red section, a green section, and a blue section. In the areas in which green and blue intersect, you will also see a smaller light blue (cyan) section. 
2 Put on your glasses and stare into the RGB color chart. If your glasses are blocking blue light, the blue section will appear much darker than before (dark blue, dark grey, or black). The light blue (cyan) section will blend in with the green section, which will also be significantly darker. If this is what you see, that means your glasses are effectively blocking at least some blue light.[11] 
1 Stare into the black and blue squares without your glasses first. To find the black and blue square test online, search "Black and Blue Square Test" to pull up the image. When you're not wearing your glasses, you should see one black square and one blue square. 
2 Look into the blue and black squares with your glasses on. If your glasses are blocking blue light, you should now see two black squares. If that's what you see, your glasses are blocking at least some blue light. 
Put on your glasses and notice the colors reflecting off the lenses. This method is not 100% accurate, but it can still give you a general idea of whether your glasses are blocking blue light. Simply put on your glasses and look into the lenses to see if you notice what color is reflecting off of them. If you see a blue tint, it means that your glasses are likely protecting you from blue light.