CBD makes glaucoma worse, researchers find
A new study reveals that it increases eye pressure, negating the effects of THC.
- For decades, marijuana has been touted as providing glaucoma relief.
- A study out of Indiana University shows that while THC reduces eye pressure, CBD does the opposite.
- Of the 18 mice tested, females were less responsive to marijuana than males.
While glaucoma has been the butt of many well-intentioned, wink-wink weed jokes for decades, the disease is quit serious. In fact, glaucoma is the leading cause of blindness in people above sixty. Glaucoma is insidious as well. Abnormally high pressure in your eyes gradually damage the optic nerve.
Vision loss is subtle until it reaches advanced stages, by which point there is little chance of slowing damage. By this point prevention is impossible.
It begins with patchy spots in your vision, mostly in the periphery or central vision. By the time glaucoma is in latter stages, tunnel vision results. Deterioration of the optic nerve is irreversible. Some treatments mitigate damage by lowering eye pressure, such as laser treatment and eye drops.
And, of course, there is marijuana, which does, in fact, lower eye pressure — specifically, THC lowers it. But there are trade-offs. Unlike other treatments, marijuana's effects last 3–4 hours, meaning you need to smoke continuously throughout the day. While pressure is reduced, the constant smoke creates other problems.
However, a new study out of Indiana University reveals that marijuana, specifically cannnabidiol (CBD), can make glaucoma worse.
The study, published in Investigative Ophthalmology & Visual Science on December 14, found that CBD — one of the hottest and, as I've previously written, suspect health trends being shoved into every product imaginable at a premium — actually creates a rise in eye pressure, the exact opposite effect a glaucoma sufferer desires.
Associate scientist Alex Straiker, who led the study, continues:
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, especially due to its use in children.
As mentioned, THC indeed lowers eye pressure, which has been the mechanism by which treatment has been administered thus far. The problem is, according to Straiker's research, CBD blocks the pressure-reducing effects that THC offers.
Illustration of glaucoma treatment using ultrasound. The ultrasound beams enable the ciliary body, the gland which produces aqueous humour, to coagulate, reducing the secretion long-term. The optic nerve is no longer under pressure, sight is maintained. Image source: BSIP / UIG via Getty Images
Which makes the science even more paradoxical and troubling for patients: CBD is being advertised as the non-psychoactive wunder drug counterpart to THC, which is what makes you high. Those who crave the benefits of marijuana without the fuzzy feeling find relief in CBD oils, tinctures, and creams. These, however, apparently will not help those with glaucoma because its greatest bioavailability comes from smoking.
It should be noted that this study was conducted on 18 mice. Interestingly, female mice were less affected by THC, which also has implications for marijuana's role in treating glaucoma. More research will have to be conducted on humans, but as Straiker concludes, this research offers new avenues of inquiry.
There were studies over 45 years ago that found evidence that THC lowers pressure inside the eye, but no one's ever identified the specific neuroreceptors involved in the process until this study. These results could have important implications for future research on the use of cannabis as a therapy for intraocular pressure.
Understanding thinking talents in yourself and others can build strong teams and help avoid burnout.
- Learn to collaborate within a team and identify "thinking talent" surpluses – and shortages.
- Angie McArthur teaches intelligent collaboration for Big Think Edge.
- Subscribe to Big Think Edge before we launch on March 30 to get 20% off monthly and annual memberships.
Rediscovering the principles of self-actualisation might be just the tonic that the modern world is crying out for.
Abraham Maslow was the 20th-century American psychologist best-known for explaining motivation through his hierarchy of needs, which he represented in a pyramid. At the base, our physiological needs include food, water, warmth and rest.
"I was so moved when I saw the cells stir," said 90-year-old study co-author Akira Iritani. "I'd been hoping for this for 20 years."
- The team managed to stimulate nucleus-like structures to perform some biological processes, but not cell division.
- Unless better technology and DNA samples emerge in the future, it's unlikely that scientists will be able to clone a woolly mammoth.
- Still, studying the DNA of woolly mammoths provides valuable insights into the genetic adaptations that allowed them to survive in unique environments.
Does believing in true love make people act like jerks?
- Ghosting, or cutting off all contact suddenly with a romantic partner, is not nice.
- Growth-oriented people (who think relationships are made, not born) do not appreciate it.
- Destiny-oriented people (who believe in soulmates) are more likely to be okay with ghosting.
SMARTER FASTER trademarks owned by The Big Think, Inc. All rights reserved.