Published in 2009
- The purpose of this study was to estimate the prevalence and causes of visual impairment(VI) and blindness by a population-based survey in an elderly rural Chinese population.
- Cluster sampling was used to select samples. The protocol consisted of an interview, pilot study, visual acuity (VA) testing and a clinical examination.
- The definitions of blindness (VA < 20/400) and visual impairment (VA < 20/60 to ≥ 20/400) were based on the presenting VA in the better eye. The major causes of VI and blindness were identified.
- The associations of bilateral VI and blindness by age, gender and education were calculated through multiple logistic regression. Cataract surgical coverage (CSC) was also calculated. Results: Among the 5559 people entered in the project, 5057 were examined (91.0%), and of these 2383(47.1%) were men.
- The mean age was 60.5 (range, 50–96) years old. The prevalence of bilateral blindness and VI was 1.9% (95% confidence interval (CI): 1.6 % to 2.3%) and 8.3%(95% CI: 7.5 % to 9.1%), respectively. We found that age, female gender, and illiteracy were associated with bilateral blindness.
- The leading cause of bilateral blindness was cataract (70.4%), followed by corneal opacity (8.2%) and glaucoma (5.1%).
- The main causes for bilateral VI were refractive error (35.9%) and cataract (35.7%). The average CSC was 9.3% (95%CI: 6.7% to 11.7%).
- Cataract is the dominant cause of bilateral blindness and VI in people over 50 years old in rural southern Harbin.
- Specific prevention and VI rehabilitation programs should be developed for the elderly rural Chinese population.
To access the study, click here: https://www.tandfonline.com/doi/abs/10.1080/09286580802227386?journalCode=iope20