Evidence supporting the use of: Cannabis
For the body system: Eyes

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Table of Contents

Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Cannabis has been explored for its effects on the eyes, primarily due to its impact on intraocular pressure (IOP), which is relevant to the management of glaucoma. Early studies from the 1970s demonstrated that smoking cannabis could reduce IOP in both healthy individuals and those with glaucoma. This effect is attributed to cannabinoids, particularly THC, which interact with cannabinoid receptors found in eye tissues. However, while the reduction in IOP is scientifically validated, the effect is typically short-lived, lasting only 3-4 hours, and frequent dosing would be required to maintain pressure reduction. Additionally, the psychoactive side effects and potential risks of long-term cannabis use limit its practicality as a mainstream treatment. Major ophthalmology organizations, including the American Academy of Ophthalmology, do not recommend cannabis as a primary therapy for glaucoma, citing the availability of more effective and longer-acting medications with fewer systemic side effects. There is minimal scientific evidence to support the use of cannabis for other eye conditions, such as macular degeneration or general vision improvement. In summary, while cannabis has a scientifically validated mechanism for lowering intraocular pressure, its use is not widely endorsed for eye health due to safety and efficacy concerns, and it is not considered a first-line treatment.

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