CBD is a chemical found in marijuana that is considered medicinal, and it has been advertised as a treatment for many issues, including glaucoma. Learn why CBD does not actually work well for eye treatment. CBD and glaucoma can be a dangerous combination. In fact, CBD products can worsen your condition! It's no substitute for medical treatment.
CBD & the Eyes: Research & Can It Help You?
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CBD has become a touted treatment for various issues, including glaucoma. This is based on older medical studies and anecdotal reports that CBD oil, eye drops, and other forms of medical marijuana help to ease anxiety, eye strain, and eye pressure.
One of the first studies on medical marijuana for eye conditions involved glaucoma. This is a group of serious eye disorders associated with damage to the optic nerve, usually due to high fluid pressure in the eye, or intraocular pressure (IOP). This pressure must be lowered to prevent blindness. Further studies of medical marijuana have found that the drug does not actually lower pressure for long enough.
The United States Food and Drug Administration (FDA) has approved CBD for some very limited medical uses, and several states have legalized both medical and recreational use of marijuana, both THC and CBD.
Dispensaries recommend CBD for eye treatment, especially glaucoma. Medical research has found that medical marijuana does not lower eye pressure for more than three or four hours, which is not long enough to prevent damage to the optic nerve. Paradoxically, it may increase the risk of damage due to fluctuations in eye pressure over the course of the day.
In fact, a recent medical study found that THC, not CBD, lowered eye pressure. By itself, CBD raises IOP, and in combination with THC, it can prevent THC from lowering IOP. THC is the intoxicating, recreational chemical in marijuana, which can be addictive and cause problems with thinking or memory.
It is important for you to follow medical advice from your optometrist and ophthalmologist to manage all eye conditions, from dry eyes to glaucoma. Don’t attempt to self-treat any eye issue with CBD.
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Cannabidiol (CBD) & Your Eyes: High Intraocular Pressure Is Dangerous
Glaucoma is a group of related eye conditions involving damage to the retina and optic nerve that leads to vision loss, typically due to high fluid pressure inside the eyes. Symptoms tend to start slowly until enough of the optic nerve is damaged that the person develops tunnel vision or another form of lost vision. Regular eye exams can help to diagnose glaucoma or high ocular pressure, so an optometrist or ophthalmologist can monitor this progression and ensure you receive appropriate treatment if you begin to lose your sight.
Treating glaucoma starts with medicated eye drops that are designed to lower intraocular pressure. If these do not work, there are several approaches to surgery that can lower fluid pressure in the eyes and prevent vision loss.
There are side effects to all these options, so many people with glaucoma, or who are at risk for glaucoma, want to find alternatives. One proposed alternative is CBD oil, or the cannabidiol molecule derived from medical marijuana.
Using Medical Marijuana Like CBD for Your Eyes Does Not Work
As marijuana has become more popular and many states have legalized both medical and recreational uses for this drug, CBD oil is being promoted for a range of uses, including as a glaucoma treatment.
There are very few medical studies on the effectiveness of CBD or medical marijuana, although the United States Food and Drug Administration (FDA) has information on potentially beneficial uses for this approach to treatment. They have approved one CBD-based drug for two types of severe, rare epilepsy. Some forms of medical marijuana have been examined to treat eye conditions, especially glaucoma, but newer research suggests that CBD is not an effective treatment for your eyes.
Medical marijuana has been touted to generally ease physical and emotional pain, including nausea related to cancer treatment, chronic pain, general anxiety disorder, and other conditions. In the 1970s and 1980s, medical marijuana was studied as an eye treatment, particularly for serious conditions like cataracts and glaucoma, which can lead to blindness. The research found that marijuana could lower intraocular pressure for three or four hours at a time, and it was more effective at lowering pressure in the eyes than glaucoma drops.
However, the studies also found that these pressure-lowering effects would wear off after a certain amount of time, while the effects of glaucoma eye drop treatment lasted at least 12 hours. It is vital for eye health that treatment to manage intraocular pressure lasts for a long time and is consistent. When eye pressure rises and lowers several times throughout the day, damage to the optic nerve can get worse.
Medical Studies on CBD & the Eyes Suggests CBD Is a Dangerous Chemical
CBD in particular is receiving a lot of attention from the medical community and medical marijuana proponents. However, studies suggest that the CBD compound may make intraocular pressure higher, while THC (tetrahydrocannabinol), the chemical in marijuana associated with substance abuse and getting high, is responsible for lowering eye pressure.
A study conducted in 2018 found that THC and CBD regulate eye pressure differently. When they are separated from marijuana, they will have radically different effects.
The results of the 2018 study found that a single dose of THC drops lowered IOP by 28 percent for 8 hours in male mice, although humans with glaucoma need 24-hour pressure relief to reduce damage to the optic nerve. The study also found two interesting problems. First, CBD inhibited THC from lowering IOP. Second, the effects of THC on eye pressure were sex-dependent, with male mice receiving noticeably greater benefit from the treatment.
- Accelerated heartbeat, which can trigger anxiety or feel like anxiety.
- Decreased blood pressure overall, which can be harmful to the cardiovascular system.
- Reduced blood flow to several parts of the body, including the optic nerve, which can increase damage.
- Increased risk of lung cancer specifically from smoking or vaping marijuana products.
- Greater risk of addiction with any amount of marijuana treatment containing THC.
- Drowsiness, memory loss, and cognitive issues associated with abusing marijuana.
- Struggles to hold down a job or drive safely if drug-tested.
Most medical research suggests that CBD does not intoxicate you the same way THC does, but taking types of medical marijuana marketed as “high CBD” might mean there are traces of THC included in the substance. THC is addictive because it can change brain chemistry to make you feel relaxed, less anxious, sleepy, or even happy. The drug can also cause negative side effects like changes in mood, spikes in anxiety or paranoia, delusions, and trouble thinking or problem-solving.
Follow Your Eye Doctor’s Treatment Plan for Treating Eye Conditions
Some dispensaries hype CBD for the eyes aside from glaucoma treatment, suggesting that it can ease pain from surgery, reduce dry eye, and even alleviate eye strain. However, there are no medical studies to back up these claims. The changes to eye pressure due to CBD may lead to damage to your vision, even if you do not have glaucoma.
The only currently approved medical approach for glaucoma is regular eye exams to monitor the condition. Follow your eye doctor’s advice to manage this condition if you are diagnosed with it. This will likely mean eye drops first to prevent vision loss. It could also mean laser eye surgery, drainage devices, or other types of surgery to alleviate intraocular pressure and reduce damage to the optic nerve.
Glaucoma. (July 2020). National Eye Institute (NEI).
Cannabidiol (CBD) – What We Know and What We Don’t. (August 2018). Harvard Health Publishing, Harvard Medical School.
Is There a Risk of Blindness With CBD? (2018). United States Food and Drug Administration (FDA).
CBD Oil May Worsen Glaucoma. (February 2019). American Academy of Ophthalmology (AAO).
What Is Marijuana? (December 2019). National Institute on Drug Abuse (NIDA).
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CBD and Glaucoma — Are They a Safe Combination?
Often touted as a magical elixir, CBD is being marketed as a treatment for just about everything, including anxiety, insomnia, pain, and even cancer. According to AARP , baby boomers are fueling its popularity and using it as a treatment for pain, arthritis, and other age-related health problems. But is CBD and glaucoma a safe combination?
The truth is that CBD oil and other products are not a good form of glaucoma treatment. In fact, it may actually increase the pressure in your eye and make your condition worse. THC, the psychoactive chemical in marijuana, may help. However, you need to use it a lot for the same effects as traditional treatment, which has its own risks. Your best choice is medicated eye drops and oral medications in the early stages, and surgery if your condition progresses.
CBD and Glaucoma — A Dangerous Combination
CBD ( cannabidiol ) is a major chemical component in marijuana that has become a popular remedy over the past few years. It can be found in oils, sprays, creams, and even dog treats. Part of its popularity is that it doesn’t get you high, although some CBD products do contain small amounts of its psychoactive cousin, tetrahydrocannabinol (THC).
CBD has many purported benefits such as helping with pain relief, stress, and even cancer-related symptoms. Unfortunately, they don’t extend to the intraocular pressure associated with glaucoma. In fact, a 2018 study from Indiana University found that it can actually increase pressure within the eye .
The study revealed that the use of CBD caused an 18 percent increase in pressure within the eye. These effects lasted for a minimum of four hours, showing that CBD can actually worsen glaucoma rather than effectively treat the eye condition. This is highly problematic since increased pressure inside the eye can eventually lead to irreversible vision loss.
On the other hand, THC provided the opposite and desired effect. Rather than increasing eye pressure, researchers found that it actually lowered it. Male mice experienced around a 30 percent reduction eight hours after being exposed to the chemical. Some male mice had a slightly lower drop to 22 percent lasting four hours.
Female mice didn’t benefit as much from THC. They only experienced a 17 percent decrease after four hours. There was no drop in eye pressure after eight hours. This has led researchers to suspect that females are less affected by THC, although it isn’t clear if this is also the case for its psychoactive effects. The study was originally published in the journal of Investigative Ophthalmology & Visual Science .
The Connection Between Mice & Humans
While performed on lab mice, the results of the study can have an important impact on CBD usage in humans. According to Dr. Alex Straiker, who led the study:
This study raises important questions about the relationship between the primary ingredients in cannabis and their effect on the eye. It also suggests the need to understand more about the potential undesirable side effects of CBD…
The American Academy of Ophthalmology currently doesn’t support the use of THC due to its medical and legal limitations as well as its risks . You would need to smoke eight to 10 times every 24 hours to effectively treat glaucoma. Its side effects wouldn’t make a good long-term treatment plan since they would interfere with everyday tasks and harm your lungs over time . increase your risk of lung cancer.
Click here to learn more about your risk of glaucoma-related vision loss!
Glaucoma Treatment in Knoxville, Tennessee
Baptist Eye Surgeons has been preserving eyesight for the Knoxville and East Tennessee area since 1987. Glaucoma works by damaging the optic nerve over time, resulting in gradual vision loss. This nerve damage is often the result of increased eye pressure, but it can be caused by other factors in certain instances.
Effective treatment for glaucoma starts with a comprehensive eye exam . These dilated exams can help diagnose glaucoma as well as other eye conditions such as cataracts and macular degeneration. Treatment in the early stages involves eye drops and oral medications to help control your eye pressure. Surgery may become necessary if your condition progresses.
Another option is the Xen Gel Stent , a minimally invasive implant. Studies suggest that this surgical option may help reduce your eye pressure as well as your need for medicated eye drops.
Are you concerned about your glaucoma symptoms? Contact us today to schedule your appointment!
Baptist Eye Surgeons is an ophthalmological practice in Knoxville, TN, and Morristown, TN. Give us a call at 865-579-3920 for more information or to schedule an appointment .