The Outcome of Ahmed Glaucoma Valve in Difficult Glaucoma Cases

One- Year Follow up of Two Models of Ahmed Glaucoma Valves (S2 and FP7) in Refractory Glaucoma

The clinical difference (mean IOP, success rate, and complications) on using S2 and FP7 models of Ahmed Glaucoma Valve that had similar dimensions and different materials used for their construction in one year follow up was evaluated.

Refractory glaucoma is a difficult subject; many glaucoma devices are tried to reduce IOP. Glaucoma devices is now an integral part of glaucoma surgery. AGV is commonly used. The investigators need to compare the efficiency and failure rate of two models of AGV. The point that is the biological reaction around capsule can affect the efficiency.

Inclusion Criteria:

1. primary glaucoma patients with repeated failed trabeculectomy or other intraocular surgery.
2. patients had secondary glaucoma known to have a high failure rate with trabeculectomy such as neovascular, uveitis, post keratoplasty glaucoma or iridocorneal endothelial syndrome-associated glaucoma.

Exclusion Criteria:

1. patients lacked light perception, unwilling or unable to give informed consent, lived out of the area and were expected to be unavailable for follow-up visits,

2. patients had previous aqueous shunt implanted in the same eye, other external impediment to supero-temporal drainage device implantation.

3. patients had silicone oil, vitreous in the anterior chamber sufficient to require a vitrectomy.

4. patients had uveitis associated with a systemic condition like juvenile rheumatoid arthritis.

5. patients had nanophthalmos, Sturge-Weber syndrome or other conditions associated with elevated episcleral venous pressure.

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