Visual disability and blindness secondary to refractive errors in Africa

Area of Science:

• Ophthalmology
• Public Health

Background:

• Optical defects, known as errors of refraction, are a significant cause of vision impairment globally.
• In Kenya, these defects account for 13% of major vision loss, ranking third after cataracts and trachoma.
• Approximately 0.5% of Kenya's population requires spectacles for normal vision, with higher rates in specific demographics like Nigerian schoolchildren (2.4%).

Purpose of the Study:

• To highlight the prevalence and impact of refractive errors on vision loss in Kenya.
• To emphasize the necessity of corrective spectacles, particularly for post-cataract surgery patients.
• To assess the feasibility and accessibility of spectacle provision in developing countries.

Main Methods:

• Analysis of existing data on vision impairment causes and prevalence in Kenya.
• Review of the role of spectacles in visual rehabilitation, including post-cataract surgery.
• Evaluation of the cost-effectiveness and local manufacturing potential of spectacles.

Main Results:

• Errors of refraction are a leading cause of preventable vision loss in Kenya.
• Spectacles are essential for achieving normal vision for a segment of the population and for WHO-defined 'normal' vision post-cataract surgery.
• Low-cost spectacles ($5/pair) are accessible through charitable organizations and can be produced locally.

Conclusions:

• Addressing errors of refraction through accessible spectacles is a critical public health intervention in Kenya.
• Local manufacturing and charitable distribution models can effectively meet the need for corrective eyewear.
• Spectacles represent the most suitable and sustainable solution for refractive errors in developing countries, unlike advanced alternatives.