James F. Boyce

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AIM To recognise automatically the main components of the fundus on digital colour images. METHODS The main features of a fundus retinal image were defined as the optic disc, fovea, and blood vessels. Methods are described for their automatic recognition and location. 112 retinal images were preprocessed via adaptive, local, contrast enhancement. The(More)
AIMS The aim was to develop an automated screening system to analyse digital colour retinal images for important features of non-proliferative diabetic retinopathy (NPDR). METHODS High performance pre-processing of the colour images was performed. Previously described automated image analysis systems were used to detect major landmarks of the retinal(More)
PURPOSE To determine whether posterior capsule opacification (PCO) is influenced by intraocular lens (IOL) material. SETTING A British teaching hospital eye department. METHODS Ninety eyes were prospectively randomized to receive a poly(methyl methacrylate) (PMMA), silicone, or AcrySof IOL. All lenses had 6.0 mm optics and PMMA haptics. A standardized(More)
AIMS To develop a system to detect automatically features of diabetic retinopathy in colour digital retinal images and to evaluate its potential in diabetic retinopathy screening. METHODS Macular centred 45 degrees colour retinal images from 1273 patients in an inner city diabetic retinopathy screening programme. A system was used involving pre-processing(More)
OBJECTIVE To compare the visual outcome, neodymium:YAG (Nd:YAG) capsulotomy rates, and percentage of posterior capsular opacification (PCO) seen with polymethylmethacrylate (PMMA), silicone, and polyacrylic intraocular lens implants 3 years after surgery. DESIGN Randomized, prospective trial. PARTICIPANTS Ninety eyes of 81 patients were examined at a(More)
PURPOSE To describe a software program developed to provide an objective assessment of the amount of posterior capsular opacification (PCO) in high-resolution digital images of the posterior capsule after cataract surgery. METHODS Images are analyzed by a set protocol of defining the area of the posterior capsule, removing the Purkinje light reflexes by(More)
PURPOSE To compare wavefront aberration, depth of focus, contrast sensitivity, and in vivo modulation transfer function (MTF) after fellow-eye implantation of aspheric and spherical intraocular lenses (IOLs). SETTINGS Department of Ophthalmology, St. Thomas' Hospital, London, United Kingdom. METHODS This prospective randomized controlled study comprised(More)
PURPOSE To describe a new method of measuring posterior capsule opacification (PCO) and intraocular lens (IOL) rotation and report the validation of the method. SETTING Ophthalmology Department, St. Thomas' Hospital, and Medical Imaging, Department of Physics, King's College, London, United Kingdom. METHOD A new interactive software program, POCOman,(More)
PURPOSE To evaluate the differences in posterior capsule opacification (PCO) and visual and optical performance between a microincision intraocular lens (IOL) and a conventional IOL. SETTING Ophthalmology Department, St. Thomas' Hospital, London, United Kingdom. METHODS Patients with bilateral cataract were prospectively randomized to receive a(More)