So far it was considered that glaucoma only encompassed the eye, but it is a degenerative disease that affects the entire visual system, including the brain. This has been demonstrated by a group of Canadian researchers. Thanks to its description of the disease, the door to specific treatments has been opened. We must not forget that glaucoma is an ocular hypertension with 67 million people in the world. It is also one of the most common ways to stay blind.