The Institute of Medicine's Mar. 1999 report "Marijuana and Medicine: Assessing the Science Base" stated on page 177:

“High intraocular pressure (IOP) is a known risk factor for glaucoma and can, indeed, be reduced by cannabinoids and marijuana. However, the effect is too short lived and requires too high doses, and there are too many side effects to recommend lifelong use in the treatment of glaucoma. The potential harmful effects of chronic marijuana smoking outweigh its modest benefits in the treatment of glaucoma.”

Mar. 1999 - “Marijuana and Medicine: Assessing the Science Base”