G is for Glaucoma: What Cannabis Can (and Can’t) Do for Your Eyes
Cannabis was one of the first approved treatments for glaucoma—but the science has changed. Here’s what older adults need to know now.
If someone told you cannabis helps with glaucoma, they weren’t wrong—but they weren’t telling the full story either.
Glaucoma was one of the very first medical conditions approved for cannabis use. That’s because THC—the psychoactive compound in marijuana—can lower intraocular pressure, a major risk factor for glaucoma-related vision loss.
But here’s what most people don’t realize: the effect is brief, the risks are real, and for many older adults, cannabis might not be the practical solution it once seemed.
So, is cannabis still worth considering for glaucoma today? Let’s dive into what the research shows, what doctors say, and how to make smart choices for your eyes—and your overall wellness.
What Is Glaucoma, and Why Does Pressure Matter?
Glaucoma is a group of eye conditions that damage the optic nerve, often because of increased pressure inside the eye (intraocular pressure or IOP). Over time, this can lead to permanent vision loss.
It’s one of the leading causes of blindness in people over 60—and while there’s no cure, lowering eye pressure can help slow the progression.
That’s why cannabis first entered the conversation. But that was decades ago, and a lot has changed since then.
Can Cannabis Really Lower Eye Pressure?
Yes, THC has been shown to reduce intraocular pressure. But there’s a catch: the effect only lasts about 3 to 4 hours. That means you’d need to take it multiple times a day to maintain any benefit.
For many older adults, that’s a dealbreaker—especially if you:
Don’t want to feel “high” all day
Are already on other medications
Have concerns about smoking or inhaling anything
And CBD? Unfortunately, studies suggest CBD doesn’t help with eye pressure—and might even increase it in some cases.
Key takeaway: Cannabis can lower eye pressure temporarily, but it’s no substitute for your prescribed glaucoma treatments.
What the Latest Research Says
Back in 1971, researchers found that smoking marijuana reduced eye pressure. This helped launch the medical marijuana movement.
Today, we know more:
THC does lower IOP—but only for a few hours
Prescription medications offer longer-lasting, more stable results
Eye doctors now generally discourage using cannabis as a primary glaucoma treatment
Cannabis simply doesn’t deliver the consistent pressure control that’s needed to protect vision long-term.
When Might Cannabis Be Helpful?
For some people, cannabis can play a supporting role in their wellness routine—especially if they’re already using it for other issues like:
Sleep problems
Chronic pain
Appetite loss
Mood or anxiety challenges
If you’re already using THC for these reasons and also have glaucoma, you may get some added benefit. But it should never replace the medications your eye doctor prescribes.
Always work with a healthcare provider to make sure cannabis fits into your treatment plan safely.
Special Considerations for Older Adults
Cannabis affects everyone differently, and older adults are more likely to experience:
Changes in balance or coordination
Interactions with other medications
Slower metabolism and longer-lasting effects
That’s why we recommend starting low, going slow, and keeping communication open with your doctors.
Want Trusted, Personalized Cannabis Guidance?
Navigating cannabis for glaucoma—or any health concern—can feel overwhelming. If you’re looking for science-backed support without the noise, you’re in the right place.
Subscribe to Senior Savvy Cannabis and we’ll send you a FREE Cannabis Strain Tracker PDF—a practical tool to help you track what works and what doesn’t based on your body, your symptoms, and your goals.
Final Thoughts: Is Cannabis Worth Trying for Glaucoma?
Cannabis can lower eye pressure—but only briefly. That makes it a poor choice as a standalone glaucoma treatment, even though it was one of the earliest medical uses for marijuana.
That said, for some older adults, it may still be a useful addition to their wellness plan—especially when used intentionally and under medical guidance.
Curious if cannabis could support your eye health or other symptoms?
Founding members of Senior Savvy get access to personalized cannabis coaching, including monthly sessions to take the guesswork out of your routine.
Join today and start building your cannabis wellness plan with confidence.
Disclaimer: The information provided on this blog is for educational purposes only and is not a substitute for professional medical advice. Always consult your healthcare provider before starting or changing any treatments, including cannabis use.