The Ophthalmology Unit,  Universiti Malaysia Sarawak (UNIMAS), Kuching, Sarawak.

The Ophthalmology Department, Sarawak General Hospital, Kuching, Sarawak, East Malaysia.



Extrusion of Ahmed Valve

Photo by Professor Chua

This 50 year-old man suffered from poorly controlled glaucoma secondary to aniridia. Previous trabeculectomies in the left eye were unsuccessful due to scarring of the blebs. An Ahmed valve was inserted which controlled the intraocular pressure. 4 months after the valve insertion the patient complained of foreign body sensation. Examination revealed anterior migration of the Ahmed valve. The intraocular pressure remained well-controlled. The valve was repositioned.


Aniridia with stem cell deficiency.


Anterior migration of the Ahmed valve.


A close-up view of the valve.

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