Epidemiologic aspects of global blindness prevention

Area of Science:

• Ophthalmology
• Public Health
• Epidemiology

Background:

• The global prevalence of blindness is not precisely known, but estimates suggest millions are affected.
• Aging populations worldwide will increase the incidence of age-related eye diseases, escalating the need for eye care.
• While corneal blindness shows a downward trend, conditions like xerophthalmia remain significant public health challenges.

Purpose of the Study:

• To estimate the global burden of blindness based on World Health Organization (WHO) definitions.
• To project the future impact of aging populations on eye care needs.
• To review current trends and interventions for major causes of visual impairment.

Main Methods:

• Utilized World Health Organization (WHO) definitions for blindness (visual acuity <3/60 or <6/60).
• Adjusted previous estimates to the 1990 world population.
• Reviewed epidemiological trends and treatment outcomes for various blinding conditions.

Main Results:

• An estimated 35 million people are blind using the <3/60 definition; this figure rises by 50% (over 50 million) with the <6/60 definition.
• Cataract, glaucoma, diabetic retinopathy, and macular degeneration will increase due to population aging.
• Corneal blindness is decreasing, but trachoma still necessitates surgery. Xerophthalmia remains a major concern, and ivermectin's role in onchocerciasis requires further study.

Conclusions:

• The global burden of blindness is substantial and projected to rise due to aging.
• Targeted interventions are needed for conditions like xerophthalmia and onchocerciasis.
• Continued efforts in treating corneal diseases and managing age-related eye conditions are crucial for preserving sight worldwide.