George A. Williams

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OBJECTIVE To assay the proteolytic activity of plasmin on the vitreoretinal junction and to assess a potential facilitating effect on posterior vitreous detachment. METHODS We injected 1 U of plasmin into the vitreous of rabbits. Some eyes underwent vitrectomy after plasmin injection. Electroretinography and electron microscopy were performed. RESULTS(More)
PURPOSE To evaluate the role of vitrectomy in eyes with diffuse diabetic macular edema associated with a taut posterior hyaloid. METHODS Records of 55 eyes of 50 patients with diabetic retinopathy and diffuse clinically significant diabetic macular edema who underwent vitrectomy with stripping of the premacular posterior hyaloid were reviewed. In all 55(More)
PURPOSE To investigate the surgical findings and outcomes after vitrectomy for a lamellar macular hole (LMH). DESIGN Retrospective, consecutive, interventional case series. PARTICIPANTS Twenty-seven patients (27 eyes) with a lamellar macular hole and central vision loss. INTERVENTION All patients underwent 3-port vitrectomy with internal limiting(More)
PURPOSE To better understand the mechanisms of action of photodynamic therapy (PDT) with verteporfin for subfoveal choroidal neovascularization (CNV), the authors evaluated the retinal and choroidal response immediately after treatment with serial optical coherence tomography (OCT) and indocyanine green angiography (ICGA). METHODS This study was a(More)
OBJECTIVE To evaluate a dexamethasone intravitreous drug delivery system (DDS) in patients with persistent (> or =90 days despite treatment) macular edema. METHODS This 6-month study randomized 315 patients with persistent macular edema with best-corrected visual acuity (BCVA) of 20/40 to 20/200 in the study eye to observation or a single treatment with(More)
There is no treatment available for vision loss associated with advanced dry age-related macular degeneration (AMD) or geographic atrophy (GA). In a pilot, proof of concept phase 2 study, we evaluated ciliary neurotrophic factor (CNTF) delivered via an intraocular encapsulated cell technology implant for the treatment of GA. We designed a multicenter, 1-y,(More)
PURPOSE To report 24-month vision and fluorescein angiographic outcomes from trials evaluating photodynamic therapy with verteporfin in patients with subfoveal choroidal neovascularization (CNV) caused by pathologic myopia. DESIGN AND SETTING Multicenter, double-masked, placebo-controlled, randomized clinical trial at 28 ophthalmology practices in Europe(More)
OBJECTIVE To evaluate the safety and efficacy of a dexamethasone intravitreous drug delivery system (DDS) in eyes with diabetic macular edema (DME). METHODS Patients with persistent macular edema (> or = 90 days' duration) were randomized to treatment with 700 microg or 350 microg of dexamethasone DDS or observation. One eye from each patient was(More)
The authors injected 25 micrograms of recombinant tissue plasminogen activator (tPA) into the anterior chamber or vitreous cavity of 23 eyes of 22 patients with severe intraocular fibrin formation that developed after vitrectomy surgery for complicated cases of proliferative vitreoretinopathy (PVR) (13 eyes), diabetic traction retinal detachment (TRD) (7(More)