Filtration surgery is performed to treat open angle glaucoma. It is also known as ‘trabeculectomy’. Glaucoma is termed as the diseases which affect the optic nerve and if left untreated, can lead to blindness.

Glaucoma is usually characterized by the increased IOP or intraocular pressure of the eye. The procedure is performed as a measure to avoid loss of vision, by lowering the intraocular pressure. Surgery cannot reverse or improve vision loss.

Filtration surgery is performed medication fails to reduce IOP, and surgery helps in prevention of further damage to the optic nerve