Many Americans still believe marijuana effectively treats glaucoma despite limited evidence | Research

The takeaway

A survey found that public perception of marijuana as an effective glaucoma treatment is widespread, despite the majority of ophthalmologists not supporting its use for this purpose.

Ophthalmologists, glaucoma patients, public health communicators, and anyone exploring cannabis for eye conditions.

Public believes marijuana treats glaucoma; most ophthalmologists disagree

What the researchers found

A significant portion of survey respondents believed marijuana is effective for treating glaucoma. This contrasts with the current ophthalmological consensus that cannabis provides only short-term, modest intraocular pressure reduction with impractical dosing requirements.

Why it matters

The glaucoma-marijuana association is one of the most well-known claims about medical cannabis, dating back decades. If public perception is misaligned with current evidence, patients may delay or avoid proven treatments.

The numbers in context

Survey respondents assessed on belief in marijuana efficacy for glaucoma. Significant proportion believed in effectiveness. Most ophthalmologists do not support cannabis for glaucoma treatment.

How the study worked

Survey assessing public perception of marijuana efficacy for glaucoma treatment, designed to complement existing data showing most ophthalmologists do not support marijuana use for glaucoma.

What this study cannot tell us

Survey methodology details limit generalizability. Public perception does not equal clinical evidence. Cannabis research for glaucoma is limited and dated. Does not assess whether belief influences actual treatment decisions.

How to read the evidence

Survey of public perception without clinical outcome data. Documents belief but does not evaluate treatment effectiveness.

When this study was published

Published 2023.

The bigger picture

The glaucoma claim has been a cornerstone of marijuana legalization advocacy since the 1970s. While cannabis does temporarily lower eye pressure, the effect is too short-lived and requires too-frequent dosing to be practical, and modern glaucoma medications are far more effective.

Questions still open

Where do people get their beliefs about cannabis and glaucoma? Would corrective public health messaging change treatment-seeking behavior?

Common questions

Does marijuana help glaucoma?

Cannabis can temporarily lower intraocular pressure, but the effect lasts only 3-4 hours, requiring impractically frequent dosing (6-8 times daily). Modern glaucoma medications provide sustained pressure control with once or twice daily dosing. Most ophthalmologists do not recommend marijuana for glaucoma treatment.

Why do so many people think marijuana treats glaucoma?

The association dates back to the 1970s when early research showed cannabis lowered eye pressure. This finding was widely publicized and became a key argument in early medical marijuana advocacy. However, subsequent research showed the effect was too brief to be clinically useful, a nuance that has not reached most of the public.

Read the original research

Public Perception of Marijuana Use for the Treatment of Glaucoma.

Journal of glaucoma, 32(7), e106-e108

View on PubMed ↗Publisher’s paper ↗

Citation

Yakobashvili, Daniela; Shah, Ronak; Oydanich, Marko; Khouri, Albert S. (2023). Public Perception of Marijuana Use for the Treatment of Glaucoma.. Journal of glaucoma, 32(7), e106-e108. https://doi.org/10.1097/IJG.0000000000002203