Labels:screenshot | black OCR: Cannabis and its proporties as a medicine. Glaucoma is a disorder that results from an inbalance within the eye. The eyeball must be almost perfectly spherical to focus light accurately in the retina. Glaucoma afflicts 1, 5 $ of the population at the age fifty and about 5 $ at the age 70. Except for degeneration of th retina in old age, it is the leading cause of blindness in the west . Marihuana reduces intraocular pressure for, on average , four to five hours, with no indications of any deleterious effects, on visual function or ocular structure.