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Showing 1-11 of 11 trials
NCT05210478
Optical Coherence Tomography (OCT) image data will be evaluated for image quality and used to test post-processing algorithms to improve detection sensitivity for ophthalmic diseases.
NCT02084745
Boston keratoprosthesis (KPro) is a piece of specialized plastic that replace sick cornea (transparent structure at the front of the eye) in patients who have failed or those who are expected to have poor results with traditional corneal transplantation. While the Kpro can offer dramatic improvement in vision, it is also associated with several complications. Glaucoma (optic nerve damage due to high pressure inside the eye) is one of the most common complications after KPro surgery and can potentially cause irreversible vision loss. The implantation of a glaucoma drainage device (GDD), a tiny tube that drains the liquid inside the eye by bypassing the natural drainage system, is an effective option to lower the eye pressure in patients with KPro. Given the frequency and potentially devastating effects of glaucoma among KPro patients, some surgeons recommend to put in a GDD as a preventative measure. However, there is no consensus on when is the best timing to perform such surgery in relation to the Boston Kpro surgery. Hypothesis: For patients undergoing the Boston KPro surgery, implanting a GDD simultaneously, at the time of surgery, is more efficacious than at 6 months later, in the prevention of the progression of glaucoma and in maintaining better visual functions. Methods: The investigators aim to recruit 40 patients over 4 years. Recruited patients will be randomly assigned to 2 groups: 1) simultaneous GDD implantation at the Boston KPro surgery, and 2) GDD implantation 6 months after the Boston KPro surgery. Once recruited, patients will be followed before the KPro surgery, postoperative day 1, week 1, month 1, 3, 6 and 12. Standard ophthalmological exam will be performed at each visit. Additional non-invasive glaucoma tests and evaluation (visual fields and optic nerve photo) will be performed on day 1, month 1, 3, 6 and 12. For patients assigned to group 2, a GDD will be implanted 6 months after the KPro surgery. They will have additional follow-ups on post-GDD surgery day 1, week 1 and month 1. Results of visual acuity, visual fields, optic nerve evaluation and complications will be compared between the two groups to determine the better timing of GDD implantation.
NCT04339907
Glaucoma is the most common threat to vision rehabilitation in patients with Boston keratoprosthesis type 1 (KPro) implantation. High intraocular pressure (IOP) is the most important risk factor for glaucoma and may lead to irreversible retinal and optic nerve damage. Glaucoma drainage device (GDD) surgery is used to divert aqueous humor (AH) from the anterior chamber to an external reservoir to regulate flow and decrease the IOP. The AH is in direct communication with any corneal damage or surgery undertaken in the anterior chamber and can serve as a source of potential biomarkers to detect early inflammatory or glaucomatous changes. Tears are also one of the most accessible and non-invasive source of biomarkers, especially in Kpro eyes where the central optic allows communication between aqueous humor and the tears at the surface of the eye. The investigators propose to test the hypothesis that distinct inflammatory mediators in the AH and tears can serve as biomarkers for glaucoma development and progression after CT, making them specifically amenable to targeted treatment strategies to minimize vision loss.
NCT00345020
The research objectives of this study are to determine if small incision Deep Lamellar Endothelial Keratoplasty (DLEK) is able to further reduce the degree of corneal astigmatism and shorten the time course of corneal topography stabilization compared to standard full thickness corneal transplant (PKP) surgery.
NCT01018888
The purpose of this study is to evaluate the stability of artificial cornea manufactured by Aurolab and to assess its visual outcomes.
NCT01547975
Currently, no demographic and surgical results comparing different donor cornea sources were available in Taiwan. National Taiwan University Hospital (NTUH), as one of the largest tertiary medical centers in northern Taiwan, is now in charge of a big part of intense care for patients receiving corneal transplantation. With detailed medical record done of these patients during care in the ward and out-patient clinic, the investigators are competence for this meaningful program.
NCT01206127
Corneal transplant is a surgical procedure where a damaged or diseased cornea is replaced by donated corneal tissue (the graft) in its entirety (penetrating keratoplasty) or in part (lamellar keratoplasty). One type of lamellar keratoplasty is DSAEK (Descemet's Stripping Automated Endothelial Keratoplasty), where only the damaged posterior section of the cornea is replaced. The purpose of this study is to investigate how immediate postoperative positioning of the patient affects the dislocation rate of the corneal graft. Since this is a new surgical method, little scientific documentation has been published in this area.
NCT00000137
To determine whether histocompatibility matching of corneal transplant donors and recipients can reduce the incidence of graft rejection in high-risk patients.
NCT00570648
Hypothesis: 1% sodium hyaluronate (Healon), applied at end of surgery to the surface of a corneal transplant will not shorten graft reepithelialization time when compared to coating with nothing. We also wish to measure and compare visual acuity in this immediate post operative period. We also wish to assess the safety of using this agent on the epithelium post-operatively. We will recruit 50 high risk patients (see inclusion criteria) here at the University of Virginia to randomly receive nothing or sodium hyaluronate (Healon) on the ocular surface at the end of surgery, and follow time to reepithelialization of the corneal transplant grafts.
NCT00411515
The purpose of this prospectively randomized multicentre study was to prove the efficacy and safety of mycophenolate mofetil (MMF) to preventing graft rejection and improvement of clear graft survival following high-risk keratoplasty. The patients of the MMF group receive MMF orally 2x1 g daily for 6 months. Endpoints were immune reaction free and clear graft survival and the occurence of side-effects.
NCT00409656
Most high risk keratoplasties are currently performed under systemic immunosuppression. Immunosuppressants are currently either Cyclosporine A or mycophenolate mofetile, administered for around 6 months. Due to potentially severe adverse effects, new immunosuppressive exerting less side effects would be desirable. Basiliximab is a monoclonal, chimeric antibody, targeted specifically against the Interleukin-2-Rezeptor from activated T-cells. This agent is known to specifically inhibit T-cell proliferation upon intravenous application only twice following transplantation. Basiliximab has already been demonstrated effective in kidney transplantation. This investigation is a prospective, randomized clinical trial on orthotopic, high-risk penetrating keratoplasty. Basiliximab is evaluated against systemic Cyclosporine A. Primary endpoint is graft rejection. Secondary endpoint is clear graft survival.