摘要Background:Human donor sclera is commonly used in glaucoma implant surgery to cover the external portion of the silicone tube and prevent its erosion through the overlying conjunc-tiva.Corneo-scleral graft is used in this study as an alternative material for its desirable properties of being transparent,higher in tensile strength,cheap and more readily available.Methods:Eighteen consecutive cases were implanted with the Ahmed glaucoma valve im-plant.The limbal portion of the silicone tube was covered by a corneo-scleral graft obtained from the corneo-scleral rim left over following corneal transplant operation.The effectiveness in protecting the tube from erosion or migration,the transparency of the patch graft and com-plications encountered after surgery were assessed.Results :At a mean follow-up of 6 months,all tubes were well protected and no complica-tions related to the patch graft were encountered during intra and postoperative period.All corneo-scleral grafts remained transparent and healthy at the latest follow-up.Conclusion:Lamellar corneo-scleral tissue from residual corneal transplant material,with its many unique properties and advantages,appears to be a cheap,easily available and ef-fective patch graft material for glaucoma implant surgery.Further explorations and studies on this material are recommended.