Green Eyeglasses Improve Anxiety and Wellness in Fibromyalgia Patients

By Pat Anson, PNN Editor

Fibromyalgia is well known as one of the most difficult chronic pain conditions to treat. The Food and Drug Administration has approved a handful of medications for fibromyalgia, but many patients find them ineffective in treating the muscles aches, joint pain, fatigue, anxiety and other symptoms that are common in fibromyalgia.  

Researchers at Duke University may have found an easy way to reduce some of those symptoms without the use of drugs. In a small study of fibromyalgia patients being treated with opioids, those who wore eyeglasses with specially tinted green lenses reported a significant improvement in their anxiety and overall sense of wellness. And while their pain levels were unchanged, their use of opioids declined.

“My research has been focused heavily on finding alternatives to opioids for pain management,” says lead author Padma Gulur, MD, Executive Vice Chair of the Department of Anesthesiology at Duke University. “One of the things we discovered early on was that there were visually mediated triggers for pain. We definitely could see that with headaches, but also that it could actually impact pain itself, the pain pathways. While we still don’t fully understand the mechanism of how pathways for pain get activated with visual mediation, it definitely does happen.

“We narrowed it down over some years to the hypothesis that with green light, particularly in the green spectrum, there was an opportunity where it was influencing pain, both chronic pain and acute pain.”

Previous research has found that green light therapy has a calming effect on the brain and is useful in treating fibromyalgia and migraines. But in those studies, participants were confined to a room where they were immersed in green light and told to avoid activities like watching TV or using their cellphones.

Gulur thought there must be an easier way to experience the benefits of green light.

“People want pain relief, but they also want to live their lives. And spending hours and hours in a room or exposure takes away from that quality of life,” she told PNN. “On the other hand, wearing eyeglasses is something we’re all very comfortable doing and, thankfully these days, colored eyeglasses are all the thing.”

Gulur and her colleagues studied 34 fibromyalgia patients who were randomly selected to wear various shades of eyeglasses at least four hours a day for two weeks: 10 patients wore blue eyeglasses, 12 wore clear eyeglasses and 12 wore green eyeglasses.

DUKE UNIVERSITY

Their findings, presented this week at the annual meeting of the American Society of Anesthesiologists, showed that participants who wore green eyeglasses were four times more likely to have reduced anxiety than those in the other two groups, who reported no reduction in anxiety. They also reported feeling better.

“We found that although their pain scores remained the same, those who wore the green eyeglasses used fewer opioids, demonstrating that their pain was adequately controlled,” said Gulur, who noted that patients who wore the green eyeglasses asked if they could keep them at the end of the study.

“They didn’t want to give them back. We had no trouble getting the blue and the clear back, but none of them wanted to return the green glasses.”

Unfortunately, they had to give them back. The eyeglasses are specially formulated to filter a specific wavelength on the green light spectrum and were needed for further study. You can’t buy the glasses online or at your local drug store. At least not yet.

Gulur and her team are planning further studies with green eyeglasses on patients with diabetic neuropathy and chronic back pain.

Pilot Study Finds Green Light Therapy Improves Fibromyalgia Symptoms

By Pat Anson, PNN Editor

Fibromyalgia patients exposed to green light therapy had significant improvements in their pain, sleep and quality of life, according to a new pilot study published in the journal Pain Medicine.

The small clinical trial by researchers at the University of Arizona is the first to explore the benefits of green light in treating fibromyalgia symptoms. Previous studies have focused on green light therapy as a treatment for migraine headaches. Green light is believed to have a calming effect on the brain and causes less eye strain.  

Twenty-one adult patients with fibromyalgia being treated at the university’s chronic pain clinic were enrolled in the study. They were exposed to green light-emitting diodes (GLED) for one to two hours daily for 10 weeks. While undergoing treatment, patients were asked to avoid all other sources of light, including computers, smartphones and television, but encouraged to engage in other activities such as reading and listening to music, and to avoid falling asleep.

“To our knowledge, this one-way crossover design efficacy-study clinical trial is the first description of a successful implementation of GLED exposure as a therapy to manage fibromyalgia pain without any reported side effects. The patients enrolled in this study reported significant reduction in their overall average pain intensity, frequency, and duration after GLED treatment,” wrote lead author Mohab Ibrahim, MD, an associate professor in the Departments of Anesthesiology and Pharmacology at UArizona College of Medicine-Tucson. 

In addition to less pain, patients also reported better mood and sleep, and improvements in their ability to work, exercise and perform chores. Eleven patients said they also reduced their use of pain medication, including opioids, while being exposed to green light.    

“GLED may be a safe and affordable method to manage fibromyalgia. We did not observe side effects in animal studies or in reports from our patients. The observed safety and efficacy, coupled with the simplicity of this method, merit further investigation and the design of a randomized clinical trial to fully investigate the role of GLED for fibromyalgia and possibly other chronic pain conditions,” researchers concluded. 

Fibromyalgia is a poorly understood disorder characterized by widespread body pain, fatigue, poor sleep and depression. Many patients report conventional treatments for fibromyalgia are ineffective or have unwelcome side effects. 

In an email to PNN, Ibrahim said he was conducting two more studies on the use of green light to treat other pain conditions, but was not ready to release his findings. He recently reported the results of a small study of green light as a preventative therapy for migraine. 

“Should anyone use green light products? The risk is low, but I still suggest people speak with their physicians first before attempting any therapy,” Ibrahim said.    

Light Sensitivity 

Although more research is needed to fully understand how green light therapy works, some commercial products are available to the public without a prescription.

One is a portable green light lamp made by Allay, a company founded by Harvard Medical School Professor Rami Burstein, PhD, who was the first researcher to discover that different colors in the light spectrum can affect light sensitivity – known as photophobia – among migraine sufferers.

Burstein learned that blue light (the light emitted by TVs and computer screens) can trigger migraines, while a narrow band of green light at low intensity can reduce the severity of migraine attacks.

“Green light has a calming effect because it reduces electrical activity (in the brain),” Burstein told PNN. “It is the only color of light that is associated with positive emotion and reducing anxiety. All other colors of light increase anxiety, irritability, being afraid, being scared, being angry, a whole host of negative emotions.”

Burstein and his partners asked lighting experts to design an affordable green light lamp that people can use at home. Initial estimates ran in the thousands of dollars, but they have since managed to reduce the cost to $150.

ALLAY IMAGE

“It is safe. It’s not invasive. It is inexpensive,” Burstein says. “Try it. Give it a month or two. If it doesn’t work, you can return it for free. No questions asked.”

Allay began selling the lamps in January with a money back guarantee. Of the 3,000 lamps sold so far, Burstein says less than 4 percent of customers have asked for their money back. He expects an updated version of the lamp to be available by the end of the year for less than $100.

Burstein says the lamp eliminates photophobia in nearly all migraine patients. He recommends that migraine sufferers use the Allay lamp one to two hours every day to reduce the frequency and severity of headaches.

Green Light Therapy Reduces Migraine Pain

By Pat Anson, PNN Editor

New research is shining a light on an unusual treatment for migraine headaches: green light therapy.

In a small study involving 29 migraine patients, University of Arizona Health Sciences researchers found that exposure to green light for one to two hours daily reduced headache pain by 60% and significantly reduced the frequency of migraines.

"This is the first clinical study to evaluate green light exposure as a potential preventive therapy for patients with migraine, " said lead author Mohab Ibrahim, MD, an associate professor in the Departments of Anesthesiology and Pharmacology at UArizona College of Medicine-Tucson. "As a physician, this is really exciting. Now I have another tool in my toolbox to treat one of the most difficult neurological conditions: migraine."

Of the 29 patients who participated in the study, seven had episodic migraine and 22 had chronic migraine. All were exposed to white light for one to two hours a day for 10 weeks. After a two-week break, they were exposed to green light for 10 weeks.

Participants also completed regular surveys and questionnaires to track the number and intensity of their headaches, as well as quality of life issues such as the ability to fall and stay asleep or to work.

Using a pain scale of 0 to 10, participants self-reported that green light exposure resulted in a 60% average reduction in their headache pain, from 8 to 3.2.

Green light also shortened the duration of headaches, and improved participants' ability to fall and stay asleep, perform chores, exercise, and work. None of the patients reported any side effects.

"In this trial, we treated green light as a drug," Ibrahim said. "It's not any green light. It has to be the right intensity, the right frequency, the right exposure time and the right exposure methods. Just like with medications, there is a sweet spot with light."

Participants were given green light emitting diodes – LED lights – with instructions to follow while completing the study at home. They were also allowed to continue current migraine therapies and to initiate new treatments if directed by their physicians.

"One of the ways we measured participant satisfaction was, when we enrolled people, we told them they would have to return the light at the end of the study. But when it came to the end of the study, we offered them the option to keep the light, and 28 out of the 29 decided to keep the light," said Ibrahim.

Most of the study participants - 86% of episodic migraine patients and 63% of chronic migraine patients - reported the number of headache days per month was reduced by at least 50 percent. Episodic migraine is characterized by up to 14 headache days per month, while chronic migraine is 15 or more headache days per month.

Ibrahim and co-author Amol Patwardhan, MD, have been studying the effects of green light therapy for several years.

"Despite recent advances, the treatment of migraine headaches is still a challenge," said Patwardhan, an associate professor and the vice chair of research in the Department of Anesthesiology. "The use of a nonpharmacological therapy such as green light can be of tremendous help to a variety of patients that either do not want to be on medications or do not respond to them. The beauty of this approach is the lack of associated side effects."

Dr. Ibrahim has been contacted by doctors in Europe, Africa and Asia, asking for information about green light therapy for their own patients.

"As you can imagine, LED light is cheap," Ibrahim said. "Especially in places where resources are not that available and people have to think twice before they spend their money, when you offer something affordable, it's a good option to try."

The study findings were published online in Cephalalgia, the journal of the International Headache Society.

A 2016 study by researchers at Beth Israel Deaconess Medical Center in Boston also found that green light therapy reduced headache severity in migraine sufferers. Patients in that study were exposed to different intensities of blue, green, amber and red light. Most patients said their migraines got worse when exposed to white, blue or amber light, while green light was found to reduce pain in 20 percent of patients.

About a billion people worldwide suffer from headaches caused by migraines, which affect three times as many women as men. Migraine affects more than 37 million people in the United States, according to the American Migraine Foundation. In addition to headache pain and nausea, migraine can cause vomiting, blurriness or visual disturbances, and sensitivity to light and sound. About half of people living with migraine are undiagnosed.

Green Light Reduces Migraine Headache

By Pat Anson, Editor

Many people who suffer from migraines will tell you that bright light can trigger a horrible headache.

But researchers at Beth Israel Deaconess Medical Center in Boston have found that a narrow band of green light can significantly reduce light sensitivity – known as photophobia – and reduce headache severity in migraine sufferers.

"Although photophobia is not usually as incapacitating as headache pain itself, the inability to endure light can be disabling," said Rami Burstein, PhD, Vice Chair of Research in the Department of Anesthesia, Critical Care and Pain Medicine and Academic Director of the Comprehensive Headache Center at Beth Israel Deaconess, as well as the John Hedley-Whyte Professor of Anaesthesia at Harvard Medical School.

"More than 80 percent of migraine attacks are associated with and exacerbated by light sensitivity, leading many migraine sufferers to seek the comfort of darkness and isolate themselves from work, family and everyday activities."

Five years ago, Burstein and his colleagues made the surprising discovery that blue light hurts migraine patients who are blind. The finding prompted research that found photophobia could be alleviated by blocking blue light. However, because that study involved only blind patients, who cannot detect all colors of light, researchers devised a way to study the effects of different colors of light on headache in patients who are not visually impaired.

In the first study of its kind, published in the journal Brain, Burstein and colleagues found that a narrow band of green light worsens migraine significantly less than other colors of light, and that low intensities of green light can even reduce headache pain.

The researchers asked 43 patients experiencing acute migraine attacks to report any change in headache when exposed to different intensities of blue, green, amber and red light.

As the intensity of the light increased every 30 seconds, patients were asked if their headache intensified. Nearly 80 percent of patients said their migraines got worse when exposed to white, blue or amber light, while green light was found to reduce pain in 20 percent of patients.

Researchers then measured the magnitude of the electrical signals generated by the retina (in the eye) and the cortex (in the brain) of patients in response to each color of light. They found that blue and red lights generated the largest signals in both the retina and the cortex, and that green light generated the smallest signals.

Researchers also used laboratory rats to study neurons in the thalamus, an area of the brain that transmits information about light from the eye to the cortex. These neurons were found to be most responsive to blue light and least responsive to green light, explaining why the migraine brain responds favorably to green light.

"These findings offer real hope to patients with migraines and a promising path forward for researchers and clinicians," said Burstein.

Burstein is now working to develop a more affordable light bulb that emits "pure" (narrow band wavelength) green light at low intensity, as well as affordable sunglasses that block all but this narrow band of pure green light. Currently, the cost of one such light bulb is prohibitively high ($360 to $500, according to this research) and the technology to block all but pure green light in sunglasses is also very costly.

Light therapy – also known as infrared or laser therapy – is also being used to treat pain from aching joints, muscles and low back pain. Red and green light are also used as a treatment for skin disorders such as acne, aging spots and wrinkles. The theory is that light therapy increases circulation and stimulates the growth of collagen in skin.

About a billion people worldwide suffer from headaches caused by migraines, which affect three times as many women as men.

Migraine affects about 36 million adults in the United States, according to the American Migraine Foundation. In addition to headache pain and nausea, migraine can cause vomiting, blurriness or visual disturbances, and sensitivity to light and sound. About half of people living with migraine are undiagnosed.