Please use this identifier to cite or link to this item: https://doi.org/10.1186/1471-2415-6-17
Title: Comparison of age-specific cataract prevalence in two population-based surveys 6 years apart
Authors: Tan, A.G
Jie, J.W 
Rochtchina, E
Mitchell, P
Keywords: adult
aged
article
brain cortex
cataract
cortical cataract
disease classification
female
groups by age
health survey
human
lens
major clinical study
male
nuclear cataract
population research
prevalence
subcapsular cataract
systematic review
age distribution
Australia
cataract
comparative study
cross-sectional study
middle aged
sex ratio
very elderly
Age Distribution
Aged
Aged, 80 and over
Australia
Cataract
Cross-Sectional Studies
Female
Health Surveys
Humans
Male
Middle Aged
Prevalence
Sex Distribution
Issue Date: 2006
Citation: Tan, A.G, Jie, J.W, Rochtchina, E, Mitchell, P (2006). Comparison of age-specific cataract prevalence in two population-based surveys 6 years apart. BMC Ophthalmology 6 : 17. ScholarBank@NUS Repository. https://doi.org/10.1186/1471-2415-6-17
Rights: Attribution 4.0 International
Abstract: Background: In this study, we aimed to compare age-specific cortical, nuclear and posterior subcapsular (PSC) cataract prevalence in two surveys 6 years apart. Methods: The Blue Mountains Eye Study examined 3654 participants (82.4% of those eligible) in cross-section I (1992-4) and 3509 participants (75.1% of survivors and 85.2% of newly eligible) in cross-section II (1997-2000, 66.5% overlap with cross-section I). Cataract was assessed from lens photographs following the Wisconsin Cataract Grading System. Cortical cataract was defined if cortical opacity comprised ? 5% of lens area. Nuclear cataract was defined if nuclear opacity ? Wisconsin standard 4. PSC was defined if any present. Any cataract was defined to include persons who had previous cataract surgery. Weighted kappa for inter-grader reliability was 0.82, 0.55 and 0.82 for cortical, nuclear and PSC cataract, respectively. We assessed age-specific prevalence using an interval of 5 years, so that participants within each age group were independent between the two surveys. Results: Age and gender distributions were similar between the two populations. The age-specific prevalence of cortical (23.8% in 1st, 23.7% in 2nd) and PSC cataract (6.3%, 6.0%) was similar. The prevalence of nuclear cataract increased slightly from 18.7% to 23.9%. After age standardization, the similar prevalence of cortical (23.8%, 23.5%) and PSC cataract (6.3%, 5.9%), and the increased prevalence of nuclear cataract (18.7%, 24.2%) remained. Conclusion: In two surveys of two population-based samples with similar age and gender distributions, we found a relatively stable cortical and PSC cataract prevalence over a 6-year period. The increased prevalence of nuclear cataract deserves further study. © 2006 Tan et al; licensee BioMed Central Ltd.
Source Title: BMC Ophthalmology
URI: https://scholarbank.nus.edu.sg/handle/10635/178020
ISSN: 14712415
DOI: 10.1186/1471-2415-6-17
Rights: Attribution 4.0 International
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