A group of conditions where the retinal ganglion cells and the optic nerve is damaged. Glaucoma is characterized by loss of sensitivity in the visual field. One of the most common risk factors is elevated eye pressure or intraocular pressure (IOP). An elevation of pressure without field loss is termed intraocular hypertension. A patient with IOP that is greater than 21 mmHg and significant visual field loss is considered a glaucoma patient. However, an individual may experience visual field loss even if IOP is within a normal limit. This is called normal tension glaucoma. At this time, doctors treat all glaucoma through various methods that are designed to lower intraocular pressure and stop visual field loss. However, while a normal IOP range is recognized, there is no such thing as a ‘safe’ pressure in glaucoma patients. Glaucoma may occur alone or as a sequelae to a variety of ocular conditions such as central retinal vein occlusion, iritis, and even as a result of past trauma to the eye.

Cannabis has been shown to reduce eye pressure and help slow the progression of glaucoma.