Glaucoma is an eye condition that occurs when the pressure inside the eye increases, damaging the optic nerve and leading to vision loss. When a person has glaucoma, the fluid inside the eye is unable to drain properly, which causes the pressure within the eye to increase. This increased pressure can damage the optic nerve, resulting in partial or complete vision loss. Glaucoma can be treated with medications, laser treatment, or surgery, depending on the severity of the condition. Early detection and treatment can help reduce the risk of permanent vision loss.