Glaucoma
FECO (Full Extract Cannabis Oil) has been used by medical cannabis patients for decades to manage glaucoma, primarily because it delivers a concentrated, whole-plant profile of cannabinoids. In the context of 2026 medical understanding, FECO is valued for its ability to target both the physical pressure in the eye and the health of the optic nerve.
1. Reduction of Intraocular Pressure (IOP)
The most well-documented benefit of FECO for glaucoma is its ability to lower intraocular pressure, which is the primary cause of optic nerve damage.
Mechanism: THC binds to CB1 receptors located in the ciliary body of the eye. This interaction reduces the production of aqueous humor (eye fluid) and improves its drainage, effectively lowering the "internal pressure."
Dose-Response: FECO can reduce IOP by approximately 25% to 30% in most patients. Because FECO is an ingestible oil, it provides a more sustained effect (6–8 hours) compared to smoking, though consistent 24-hour management remains a challenge that requires precise dosing.
2. Neuroprotection of the Optic Nerve
Newer research focuses on the idea that glaucoma is not just a "pressure" problem but a neurodegenerative one.
Prevention of Cell Death: Cannabinoids in FECO, particularly CBD and THC, have antioxidant and anti-inflammatory properties that may protect retinal ganglion cells from "excitotoxicity"—a process where overstimulated nerves die off.
Vasodilation: FECO may act as a vasodilator, potentially increasing blood flow to the optic nerve. This is crucial because poor blood supply can worsen vision loss even if eye pressure is kept low.
3. Management of Ocular Pain and Nausea
For patients with Acute Angle-Closure Glaucoma, symptoms can include intense eye pain, headaches, and nausea.
Analgesic Properties: The "Full Extract" nature of FECO includes terpenes like Myrcene and Linalool, which work synergistically with cannabinoids to provide deep pain relief.
Antiemetic Effects: FECO is highly effective at suppressing the severe nausea and vomiting that can accompany sudden spikes in eye pressure.
Important Clinical Considerations
While FECO offers these benefits, medical professionals highlight a few "double-edged" effects:
| Benefit | Potential Risk |
|---|---|
| Lowered IOP | Short Duration: Effects wear off in 3–6 hours; pressure can "rebound" if a dose is missed. |
| Neuroprotection | Blood Pressure: FECO can lower systemic blood pressure, which might actually reduce blood flow to the eye in some patients. |
| Full Spectrum | CBD Levels: High levels of CBD (if the FECO is hemp-based) have occasionally been shown to increase eye pressure. High-THC FECO is generally preferred for glaucoma. |
Usage Tip
To maintain stable eye pressure throughout the night, many patients use a slightly larger dose of FECO before bed. This "slow-release" effect from digestion helps prevent the early-morning pressure spikes that are common in glaucoma patients.
