Use of cataract services in eastern Africa--a study from Tanzania

Area of Science:

• Ophthalmology
• Public Health
• Global Health

Background:

• Cataract surgery is a critical intervention for restoring vision.
• Understanding the pre-operative visual status of patients is essential for effective service delivery.
• Tertiary referral centers in Tanzania serve a diverse patient population with varying visual impairments.

Purpose of the Study:

• To determine the prevalence of blindness and low vision among patients seeking cataract surgery in Tanzanian tertiary centers.
• To identify demographic and clinical factors associated with pre-operative blindness in this patient cohort.

Main Methods:

• A retrospective analysis of 4258 cataract operations performed on 3765 patients across two Tanzanian hospitals.
• Data collected from computerized audit systems included pre-operative visual status, age, gender, and mode of presentation (walk-in vs. outreach).
• Visual status was categorized based on the vision in the better eye.

Main Results:

• 32% of patients undergoing cataract surgery were blind, 37% had low vision, and 31% had normal vision.
• Factors significantly predicting pre-operative blindness included female sex (OR 1.15), referral from rural outreach (OR 1.75), and older age (OR 1.02).

Conclusions:

• Cataract services in Tanzania cater to a spectrum of visual acuities, not exclusively the blind.
• The uptake of surgery by normally sighted individuals suggests a positive trend towards cataract prevention.
• Targeted interventions for rural populations and the elderly are crucial to maximize the benefits of cataract surgery programs for those most in need.