Robert L. Johnston

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AIMS To identify and quantify risk factors for posterior capsule rupture or vitreous loss or both (PCR or VL or both) during cataract surgery and provide a method of composite risk assessment for individual operations. METHODS The Cataract National Dataset was extracted on 55,567 operations from 12 National Health Service (NHS) Trusts using an electronic(More)
PURPOSE Removal of silicone oil after vitreoretinal surgery reduces potential complications of glaucoma and cataract and improves visual function in 30% of patients. We report the clinical findings of a series of patients who experienced unexpected and permanent visual loss after removal of silicone oil. METHODS Seven patients with visual loss after(More)
AIMS To pilot the use of the Cataract National Dataset (CND) using multi-centre data from Electronic Patient Record (EPR) systems and to demonstrate the ability of the CND to deliver certain of its intended benefits, including detailed preoperative profiling of cataract surgery patients and updating of benchmark standards of care in the NHS and beyond. (More)
AIMS This study aims to establish the prevalence of aspirin, dipyridamole, clopidogrel, and warfarin use in patients undergoing cataract surgery, and to compare local anaesthetic and intraoperative complication rates between users and non-users. METHODS The Cataract National Dataset was remotely extracted and anonymised on 55,567 operations at 12 NHS(More)
PURPOSE To assess how intraocular lens (IOL) formula choice affects refractive outcomes after cataract surgery using IOLMaster biometry. SETTING Department of Ophthalmology, Gloucestershire Hospitals NHS Foundation Trust, Cheltenham, United Kingdom. DESIGN Database study. METHODS Hypothetical prediction errors were retrospectively calculated on(More)
Eight patients were observed who suffered varying degrees of visual loss secondary to multiple recurrent hemorrhages or serous fluid beneath the retinal pigment epithelium and neurosensory retina in the posterior fundus. Vitreous hemorrhage occurred in two patients. In all patients, hemorrhages or exudates were associated with orange subretinal lesions of(More)
OBJECTIVE To describe the surgical technique, visual acuity results, and complications of sutured posterior chamber intraocular lenses with complete pars plana vitrectomy. METHOD A retrospective review of 63 eyes was combined with a telephone survey of the patients and their ophthalmologists. RESULTS The preoperative diagnoses were trauma, 25 eyes;(More)
PURPOSE To study macular hole (MH) surgery in terms of baseline demographics, intraoperative complications, post-vitrectomy cataract, reoperation, and visual outcome. DESIGN National Ophthalmology Database study. PARTICIPANTS A total of 1078 eyes from 1045 patients undergoing primary MH surgery. METHODS Participating centers prospectively collected(More)
AIMS To demonstrate variations in posterior capsule rupture (PCR) rate between surgeons of the same and different grades as a by-product of routine clinical care. METHOD NHS departments using electronic medical record (EMR) systems to collect the Cataract National Dataset (CND) were invited to submit data. Data were remotely extracted, anonymised,(More)
OBJECTIVES To perform DNA linkage studies in an extensive 5-generation British pedigree with dominant optic atrophy and to validate the efficacy of domiciliary screening for affected members. METHODS Family members received a domiciliary examination based on corrected visual acuity, color vision, visual field defects, and optic disc appearance; DNA(More)