Carolyn M Machan

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PURPOSE Diabetes has been shown to be a risk factor for age-related (AR) cataract. As statins (HMG-CoA reductase inhibitors) are now commonly prescribed for patients with type 2 diabetes, their impact on AR cataract prevalence should be considered. This study determines associations between AR cataract, type 2 diabetes, and reported statin use in a large(More)
PURPOSE To report on the prevalence of age-related (AR) cataract in an optometric clinic population including male and female subgroups. METHODS Retrospective patient file data reviewed for the Waterloo Eye Study database included age, sex, date of lens extraction (LE), and presence of AR cataract [nuclear sclerosis (NS), cortical cataracts (CC),(More)
PURPOSE To determine data quality in the Waterloo Eye Study (WatES) and compare the WatES age/sex distribution to the general population. METHODS Six thousand three hundred ninety-seven clinic files were reviewed at the University of Waterloo, School of Optometry. Abstracted information included patient age, sex, presenting chief complaint, entering(More)
PURPOSE The study's aim was to report prevalence estimates and age-related trends in refractive error in a clinic-based series and compare them to results from studies of a similar nature conducted since 1892. METHODS Refractive error, patient age, and sex were collected from the files of all patients seen at the University of Waterloo School of Optometry(More)
PURPOSE The purpose of this study was to examine the prescribing patterns of academic optometrists for infants, children, and teenagers with hyperopia and the factors that affected the decision to prescribe. A comparison was made to published guidelines for prescribing for hyperopia in children. METHODS The Waterloo Eye Study (WatES) database is a(More)
PURPOSE To determine the prevalence of binocular vision (BV) and eye movement disorders in a clinic population of older adults. METHODS Retrospective clinic data were abstracted from files of 500 older patients seen at the University of Waterloo Optometry Clinic over a 1-year period. Stratified sampling gave equal numbers of patients in the 60 to 69, 70(More)
PURPOSE To determine if routine eye examinations in asymptomatic patients result in spectacle prescription change, new critical diagnosis, or new management of existing conditions. We also investigate whether age and time between assessments (assessment interval) impact detection rates. METHODS The Waterloo Eye Study (WatES) database was created from a(More)
OBJECTIVE To investigate changes in distance best corrected visual acuity (BCVA) relative to presenting visual acuity (PVA) as a function of age and the number of years between eye examinations. DESIGN Retrospective cross-sectional study. PARTICIPANTS 6397 patient files at a large Canadian Optometric Clinic. METHODS A retrospective file review of(More)
PURPOSE The purpose of this study was to determine how optometric practitioners modify the subjective refractive result when prescribing spectacles. METHODS Refractive data were gathered for patient visits at the School of Optometry, University of Waterloo, between January 2007 and January 2008. The entering prescription, subjective refraction, and(More)
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