Abstract
Complex and refractory glaucoma cases, non-responsive to maximal management, require surgical intervention. The Ahmed Valve, a Glaucoma Drainage Device, is widely used in these scenarios. It may be implanted into the anterior chamber, ciliary sulcus and pars plana. However, there is no general consensus in the literature on which location is best when corneal protection is considered. This paper aimed to review all these studies, including ours, to determine which may be best, while still not compromising on valve efficacy in intraocular pressure reduction.
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