Avoidable Blindness in Southern Malawi
Author Information
Author(s): Kalua Khumbo, Lindfield Robert, Mtupanyama Maxwell, Mtumodzi Davie, Msiska Vincent
Primary Institution: Department of Ophthalmology, College of Medicine, University of Malawi
Hypothesis
What is the prevalence and causes of blindness in persons aged 50 and above in southern Malawi?
Conclusion
The prevalence of blindness and visual impairment in persons aged 50 and above was lower than the WHO estimate for Malawi, with cataract being the most common cause.
Supporting Evidence
- 3,583 persons aged 50 and above were sampled, with 3,430 examined.
- The prevalence of blindness was found to be 3.3%.
- Cataract was the leading cause of blindness, accounting for 48.2% of cases.
- The cataract surgical coverage for blind persons was only 44.6%.
Takeaway
This study looked at older people in southern Malawi to see how many were blind and why. They found that many cases of blindness could be prevented, especially from cataracts.
Methodology
A population-based survey was conducted in 7 districts, examining visual acuity and categorizing causes of visual loss.
Potential Biases
Potential biases in self-reported data regarding reasons for not having surgery.
Limitations
The small number of blind individuals limited the ability to make broader conclusions, and some conditions were only diagnosed clinically without specialized equipment.
Participant Demographics
The sample included 1,361 males (38%) and 2,222 females (62%), representing the population demographics of southern Malawi.
Statistical Information
P-Value
0.0001
Confidence Interval
95% CI 2.5–4.1
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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