View clinical trials related to Diabetic Retinopathy.
Filter by:The purpose of the study is to evaluate intravitreal injection of triamcinolone acetonide after laser panretinal photocoagulation in the treatment of proliferative diabetic retinopathy.
The study objective is to determine the course of changes in OCT measured macular thickness and visual acuity following a single session of focal photocoagulation for center-involved DME. The response will be evaluated separately in eyes with and without prior focal photocoagulation for DME. The purpose is to determine the proportion of eyes that continue to improve at least 5 letters in visual acuity or at least 10% in central retinal thickness after a session of focal photocoagulation. In addition, the study will explore whether any baseline factors can be identified that are predictive of the response. All subjects will have follow-up visits 8 weeks and 16 weeks post treatment. At the 16-week visit, study eyes are evaluated for change in retinal thickness and visual acuity from baseline. - Treatment is to be deferred and follow up continued if visual acuity letter score has improved by >5 or OCT central subfield thickness has decreased by >10% compared with baseline. - If visual acuity letter score has not improved by at least 5 and OCT central subfield thickness has not decreased by at least 10%, then the eye is classified as 'not improved' and the investigator may provide additional treatment. Follow up ends for eyes that receive additional treatment at this visit. However, if the investigator and participant elect to defer additional treatment (even if deferral criteria are not met), then follow up will continue until the study eye receives additional treatment for DME. - Eyes continuing in follow up have visits every 8 weeks (+1week) as long as there has been continued improvement in visual acuity (letter score improved >5 ) or retinal thickness (central subfield thickness decreased by >10%) compared with the visit 16 weeks earlier. The longest follow-up time will be 48 weeks. By providing information on the length of time during which clinically meaningful improvement occurs following focal photocoagulation, clinicians will be better able to determine when further photocoagulation or other treatments should be considered for persistent DME. Depending on the results of this study, a future randomized clinical trial will be considered comparing the more aggressive retreatment photocoagulation regimen currently serving as the standard DRCR Network approach to focal photocoagulation for macular edema with the less aggressive regimen evaluated in this protocol.
Recently, intravitreal bevacizumab (Avastin) injection has gained popularity as a potential treatment of intraocular neovascularization (CNV) associated with age related macular degeneration and diabetic retinopathy. The efficacy of the drug is thought to be related with its pharmacologic blockade of VEGF. The purpose of this study is to determine the effect of the intravitreal bevacizumab on the fibrovascular membrane associated with proliferative diabetic retinopathy by objective histologic evaluation. The patients scheduled for vitrectomy for tractional fibrovascular membrane due to proliferative diabetic retinopathy will be randomized into two treatment groups. The one will receive conventional vitrectomy and the other group will receive intravitreal bevacizumab injection one week before the scheduled vitrectomy. The fibrovascular membrane will be excised during surgery and fixated for histologic examinations. The expression of VEGF and PEDF, a potent inhibitor of angiogenesis, will be evaluated in the fibrovascular membrane by immunohistochemistry. The results will be compared between two treatment groups.
The formation of new blood vessels (angiogenesis), blood vessel leakage, and inflammation contribute to the progression of the eye disease, age-related macular degeneration (AMD), which is the leading cause of irreversible, severe loss of vision in people 55 years of age and older in the developed world. TG100801 is a new drug that inhibits ocular angiogenesis, vascular leak, and inflammation in laboratory studies, and may have great utility in the treatment of diseases such as AMD. The purpose of this study is to assess the safety, ocular tolerability, and blood pharmacokinetics of TG100801 at escalating doses in healthy volunteers.
The aim of the present study is to compare the functional and clinical differences and advantages between a standard operating system and a newly developed even smaller system for pars plana vitrectomy. The present study may work out the possible advantages and disadvantages between the routinely used 20-gauge vitrectomy system and the newly developed 23-gauge device.
The retinal vasculature changes dramatically in patients with diabetic retinopathy especially between non-proliferative and proliferative disease. The retinal vasculature can be imaged and quantified using special dyes. This study will test whether the pattern of the retinal vasculature changes in patients with different levels of diabetic retinopathy can be quantified using computerized image analysis. In addition, the study will evaluate whether new drugs to treat diabetic retinopathy will be able to reverse these vascular changes.
Phase I/II study with intravitreal triamcinolone acetonide microspheres(RETAAC)for treatment of diffuse diabetic macular edema unresponsive to laser photocoagulation. Study hypothesis is that single intravitreal injection of RETAAC is safe and efficient compared to conventional treatment. Fifty patients will participate in this study and will be randomized into treatment and observation groups. Efficacy will be evaluated by best corrected visual acuity and macular thickness measured by optic coherence tomography (OCT) after 12 months of treatment.
To investigate the feasibility and advantages of using perfluorocarbon liquid (PCL) perfusion to remove vitreous during suction-cutting vitrectomy using a dual, dynamic drive (3D)technology. In complicated surgeries in advanced diabetic retinopathy and retinal detachment
The project aims to find mechanisms for the abnormal retinal blood flow that in diabetic patients often precedes any evidence of clinical retinopathy and may contribute to the development of retinopathy. Specifically, the projects tests the hypothesis that reduced retinal blood flow found in young patients with type 1 diabetes reflects increased resistance in the small vessels of the retina caused by the formation of small blood clots, called microthrombi; and that antiplatelet agents normalize the reduced retinal blood flow.
The purpose of this study is to characterize the disease Ocular Ischemic Syndrome.