Glaucoma is a neurodegenerative disease of the eye, and it presents with visual field defects accompanied by progressive degeneration of the optic nerve and retinal ganglion cells (RGCs). It is one of the major causes of blindness worldwide and affects 1 in 20 people over the age of 40. Glauco-ma is caused by multiple factors, but it is usually associated with elevated intraocular pressure (IOP).