Glaucoma surgery is primarily performed to preserve existing vision rather than restore vision that has already been lost. Glaucoma-related damage to the optic nerve is irreversible, which makes early and effective pressure management the cornerstone of treatment. Surgical intervention becomes critical when other treatment methods are unable to sufficiently slow disease progression.

By reducing intraocular pressure, glaucoma surgery decreases ongoing stress on the optic nerve. This pressure control helps stabilize visual fields and prevents further narrowing of peripheral vision, which is a common consequence of uncontrolled glaucoma. Even small reductions in pressure can have a meaningful impact on long-term vision preservation.

Patients often expect visual improvement after surgery, but it is important to understand that success is measured by disease stabilization. Maintaining current vision levels allows patients to continue daily activities such as reading, driving, and navigating their environment safely.

Preserving vision also supports emotional well-being and independence. Through timely intervention and proper follow-up, glaucoma surgery plays a crucial role in protecting functional sight and improving long-term quality of life.