You are precisely correct. Marijuana can lower intraocular pressure, but the effect is quite transitory and the effect is not significant. In very rare cases it could be added to a medical regimen to induce an additional IOP-lowering effect if surgery were not even lowering pressure enough. However, this situation would be quite uncommon. Because there are so many effective IOP-lowering drops on the market that have fewer side effects, medical marijuana becomes nearly irrelevant.
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Disclaimer: My opinion is solely informative and does not constitute an informed medical opinion or recommendation. For an informed medical opinion and/or recommendation you must see an eye doctor.