Jump to topic
Jump to topic
Blue light blocking glasses sales have skyrocketed in the last few years. Especially in 2020, with the COVID-19 pandemic increasing digital screen time for people of all ages.
Companies that produce blue light glasses (also called computer glasses), such as Zenni and Warby Parker, claim that these lenses can improve your lifestyle. Their two central claims are:
Digital Eye Strain
According to the American Academy of Ophthalmology1 and multiple studies,2, 3, 4 blue light from digital screens has little to no effect on digital eye strain symptoms. More research is needed to draw conclusions, but it is unlikely that blue light blocking lenses can help reduce symptoms of digital eye strain.
Multiple studies have linked exposure to blue light with decreased melatonin levels and poor sleep quality.5, 6 More studies have shown that blue-light blocking glasses may provide a viable method for preventing melatonin suppression and increasing sleep quality.7, 8 Again, more research is needed to prove these theories. However, it seems likely that blue light blocking lenses have the potential to help improve your body’s circadian rhythm.
Blue light comes from digital screens, the sun, fluorescent lighting, and LED lighting. It contains the most energy of all visible light. Invisible light, also known as ultraviolet or UV, has even higher energy levels and is proven to cause eye diseases.9, 10, 11 However, no harmful UVA or UVB light is emitted from computers, tablets, lamps, or TV monitors.12
Blue light plays an important role in your circadian rhythm. Exposure to sunlight throughout the day helps synchronize your body’s internal clock and natural processes.13 These processes include your wake/sleep cycle, cardiovascular system (heart rate, blood pressure, etc.), and core body temperature regulation, among others.
Poor circadian rhythms may lead to:14
Blue light exposure in the average human has increased significantly within the past few decades. The sun used to be our only source of blue light. Now, with a huge increase in fluorescent and LED lighting, many of our offices, homes, and stores are filled with blue light.
Computer, tablet, and cell phone screen exposure have also increased exponentially. Many of us use these devices long after the sun has set. This can decrease our melatonin production. Melatonin is a hormone released by the pineal gland. It helps control your sleep-wake cycle.
Research suggests that wearing blue light blocking glasses before bed can effectively treat melatonin suppression.8
Computer vision syndrome (CVS), or digital eye strain (DES), is a group of eye health and vision problems. They result from prolonged computer, cell phone, tablet, or e-reader use.
Common symptoms include:
There are numerous causes of these symptoms, including
Notice that blue light is NOT listed as a cause of digital eye strain.
At this time, only a few studies have attempted to measure the effect of blue-blocking filters on digital eye strain. However, the studies that have come out and the American Academy of Ophthalmology (AAO) suggest that there is no evidence that computer screen light is damaging to your eyes. In addition, blue light filters do not provide any relief for digital eye strain.
In fact, according to the AAO:
“It’s not necessary to spend money on special eyewear for computer use. Here’s why:
If you’re looking to help improve your symptoms of computer vision syndrome or digital eye strain, blue light blocking glasses are NOT recommended. However, DES affects many people, especially those who work online. Here are some tips to help minimize symptoms of DES.
Digital eye strain is not caused by blue light. It is caused by the ways we use our digital devices. Here are some methods you can use to combat digital eye strain:
If you are experiencing any digital eye strain symptoms, we suggest speaking with your local ophthalmologist or eye health specialist. They can check your eyes for undiagnosed vision problems, recommend best practices, and suggest any products that may help improve your condition.
Here’s what science says about blue light blocking glasses in regards to your eye and overall health:
If you’re interested in purchasing a pair of blue light glasses, read our review of the Best Blue Light Blocking Glasses
(1) Vimont, Celia. Are Blue Light-Blocking Glasses Worth It? Edited by Rahul Khurana, American Academy of Ophthalmology, 5 Mar. 2021,
(2) Palavets, Tatsiana, and Mark Rosenfield. “Blue-Blocking Filters and Digital Eyestrain.” Optometry and Vision Science : Official Publication of the American Academy of Optometry, U.S. National Library of Medicine, Jan. 2019.
(3) Rosenfield, Mark, et al. “A Double-Blind Test of Blue-Blocking Filters on Symptoms of Digital Eye Strain.” Work (Reading, Mass.), U.S. National Library of Medicine, 2020, pubmed.ncbi.nlm.nih.gov/32007978/.
(4) Singh, Sumeer, et al. “Do Blue-Blocking Lenses Reduce Eye Strain from Extended Screen Time? A Double-Masked, Randomized Controlled Trial.” Elsevier, American Journal of Opthalmology, 9 Feb. 2021.
(5) Gooley, Joshua J, et al. “Exposure to Room Light before Bedtime Suppresses Melatonin Onset and Shortens Melatonin Duration in Humans.” The Journal of Clinical Endocrinology and Metabolism, Endocrine Society, Mar. 2011.
(6) Figueiro, Mariana G, et al. “The Impact of Light from Computer Monitors on Melatonin Levels in College Students.” Neuro Endocrinology Letters, U.S. National Library of Medicine, 2011.
(7) Wood, Brittany, et al. “Light Level and Duration of Exposure Determine the Impact of Self-Luminous Tablets on Melatonin Suppression.” Applied Ergonomics, U.S. National Library of Medicine, 2012.
(8) Sasseville, Alexandre, et al. “Blue Blocker Glasses Impede the Capacity of Bright Light to Suppress Melatonin Production.” Journal of Pineal Research, U.S. National Library of Medicine, Aug. 2006.
(9) Roberts, Joan E. “Ultraviolet Radiation as a Risk Factor for Cataract and Macular Degeneration.” LWW, Eye & Contact Lens: Science & Clinical Practice, July 2011.
(10) Coroneo, Minas. “Ultraviolet Radiation and the Anterior Eye: Eye & Contact Lens.” LWW, Eye & Contact Lens: Science & Clinical Practice, July 2011.
(11) Taylor, H R. “Ultraviolet Radiation and the Eye: an Epidemiologic Study.” Transactions of the American Ophthalmological Society, U.S. National Library of Medicine, 1989.
(12) Duarte, Ida Alzira Gomes, et al. “Ultraviolet Radiation Emitted by Lamps, TVs, Tablets and Computers: Are There Risks for the Population?” Anais Brasileiros De Dermatologia, Sociedade Brasileira De Dermatologia, 2015.
(13) Tosini, Gianluca, et al. “Effects of Blue Light on the Circadian System and Eye Physiology.” NCBI, Molecular Vision, 24 Jan. 2016.
(14) “Circadian Rhythm Disorders.” National Heart Lung and Blood Institute, U.S. Department of Health and Human Services, 5 Sept. 2019.