The Ahmed Glaucoma Valve is a complex implant used primarily for complicated cases of refractory glaucoma (glaucoma resistant to other treatments).
Structure and Uniqueness of the Valve
The implant consists of a delicate silicone tube connected to a small plate that is sutured to the sclera, far behind the eyelids so it is not visible. The tube is inserted into the eye and channels fluid to the plate. The unique feature of the Ahmed Valve is its built-in one-way valve mechanism: the valve opens only when the pressure in the eye rises above a certain threshold (usually 8 mmHg), thereby protecting the eye from dangerously low pressure drops in the first days after surgery.
Who is it intended for?
The Ahmed Valve is an ideal solution for advanced glaucoma patients whose previous surgeries have failed, patients with neovascular glaucoma (secondary to diabetes, for example), or glaucoma resulting from chronic eye inflammation (uveitis).