Is it true that marijuana cures glaucoma?

No: There is no known cure for glaucoma. Glaucoma requires careful monitoring and proper management when present.

Sometimes helpful: Marijuana is one of many agents that can lower eye pressure - the most controllable part of glaucoma. A few types of glaucoma are curable (angle closure for instance). But most require chronic management which can be quite successful. Stick closely with your ophthalmologist.