Learn More
OBJECTIVES To estimate the prevalence of avoidable blindness in > or =50-year-olds in Nakuru district, Kenya, and to evaluate the Rapid Assessment for Avoidable Blindness (RAAB), a new methodology to measure the magnitude and causes of blindness. DESIGN Cross-sectional population-based survey. PARTICIPANTS Seventy-six clusters of 50 people 50 years or(More)
BACKGROUND The World Health Organization estimates that there were 37 million blind people in 2002 and that the prevalence of blindness was 9% among adults in Africa aged 50 years or older. Recent surveys indicate that this figure may be overestimated, while a survey from southern Sudan suggested that postconflict areas are particularly vulnerable to(More)
AIM To determine whether monitoring of cataract outcome can be implemented as a routine activity in different hospital settings in Africa and Asia, and to assess the impact of routine monitoring. METHODS Eight eye centres in Asia and Africa were involved in the study between 1 June and 31 December 2000. Seven centres used a specifically designed cataract(More)
OBJECTIVE To test the applicability of lot quality assurance sampling (LQAS) for the rapid assessment of the prevalence of active trachoma. METHODS Prevalence of active trachoma in six communities was found by examining all children aged 2-5 years. Trial surveys were conducted in these communities. A sampling plan appropriate for classifying communities(More)
AIMS To estimate the magnitude and causes of blindness in people aged > or =50 years in Satkhira district, Bangladesh, and to assess the availability of cataract surgical services. METHODS 106 clusters of 50 people aged > or =50 years were selected by probability-proportionate to size sampling. Households were selected by compact segment sampling.(More)
OBJECTIVE To report on the use of lot quality-assurance sampling (LQAS) surveys undertaken within an area-sampling framework to identify priority areas for intervention with trachoma control activities in Viet Nam. METHODS The LQAS survey method for the rapid assessment of the prevalence of active trachoma was adapted for use in Viet Nam with the aim of(More)
OBJECTIVES To review recent data on blindness and low vision due to cataract in Latin America. METHODS Presentation of findings from population-based prevalence surveys conducted between 1999 and 2006 in nine Latin American countries covering 30,544 people aged 50 years and older. RESULTS Prevalence of cataract blindness in people 50 years and older(More)
OBJECTIVES To conduct rapid assessments of avoidable blindness to estimate the magnitude and causes of blindness in people aged >/=50 years in Negros Island and Antique district, Philippines. METHODS Clusters of 50 people aged >/=50 years were sampled with probability proportionate to size. Households within clusters were selected through compact segment(More)
OBJECTIVE To estimate the costs and effects of alternative strategies for annual screening of school children for refractive errors, and the provision of spectacles, in different WHO sub-regions in Africa, Asia, America and Europe. METHODS We developed a mathematical simulation model for uncorrected refractive error, using prevailing prevalence and(More)