Simply put, glaucoma is a disease in which vision is reduced due to damage to the optic nerve caused by increased intraocular pressure. However, it can also manifest itself as a condition in which the pressure in the eye is not high, but the blood flow to the eye is reduced, resulting in optic nerve atrophy, which in turn impairs vision. To date, there is still no effective treatment for optic nerve atrophy, and once it occurs, it is irreversible, and even after treatment, the damaged visual function cannot be restored. Therefore, if left untreated, glaucoma can lead to blindness. It ranks second only to cataracts in terms of blindness.