Blindness and severe visual impairment in pupils at schools for the blind in Burundi

Patrick Ruhagaze1, Kahaki Kimani Margaret Njuguna, Lévi Kandeke

  • 1Department of Eye, University of Nairobi, Nairobi, Kenya.

Insights

Cornea and lens pathologies are leading causes of childhood blindness in Burundi. Many cases lack identified causes, highlighting the need for enhanced public health and pediatric eye care services.

Area of Science:

  • Ophthalmology
  • Public Health
  • Pediatrics

Background:

  • Childhood blindness and severe visual impairment pose significant challenges in low-resource settings.
  • Understanding the specific etiological factors is crucial for effective intervention and service planning.

Purpose of the Study:

  • To identify the causes of childhood blindness and severe visual impairment among students in schools for the blind in Burundi.
  • To inform the planning and development of essential eye care services for children in the country.

Main Methods:

  • A comprehensive eye examination was conducted on pupils attending three schools for the blind in Burundi.
  • Data collection utilized a modified World Health Organization/Prevention of Blindness and Visual Impairment (WHO/PBL) eye examination record form.
  • Analysis focused on visual impairment that occurred before the age of 16 years.

Main Results:

  • 117 pupils with visual impairment before age 16 were examined, with 109 (93.2%) classified as blind or severely visually impaired.
  • The primary anatomical causes were cornea pathology/phthisis (23.9%), lens pathology (18.3%), uveal lesions (14.7%), and optic nerve lesions (11.9%).
  • The underlying etiology of visual loss remained unknown in a significant majority of cases (74.3%). Poor surgical outcomes were noted for lens-related blindness.

Conclusions:

  • Identified causes underscore the need for sustained public health strategies and specialized pediatric ophthalmology services in Burundi.
  • The study highlights the importance of community-based programs for early identification and referral of children with visual impairments.
  • Addressing unknown etiologies and improving surgical outcomes are critical for managing childhood blindness effectively.
Abstract

Related Concept Videos

Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
Focusing of Light in the Eye01:16

Focusing of Light in the Eye

Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
Unrenewable Cells00:50

Unrenewable Cells

In humans, the photoreceptor cells of the eye and sensory hair cells of the ear lack stem cells. These cells are thus unrenewable and cannot be replaced when they are damaged or destroyed.
Photoreceptors
The retina is composed of several layers and contains specialized cells called photoreceptors. The photoreceptors (rods and cones) change their membrane potential when stimulated by light energy. There are two types of photoreceptors—rods and cones—which differ in the shape of their outer...
Blind Procedures02:07

Blind Procedures

Ideally, the people who observe and record the children’s behavior are unaware of who was assigned to the experimental or control group, in order to control for experimenter bias. Experimenter bias refers to the possibility that a researcher’s expectations might skew the results of the study. Remember, conducting an experiment requires a lot of planning, and the people involved in the research project have a vested interest in supporting their hypotheses. If the observers knew which child was...
Diabetic Retinopathy01:27

Diabetic Retinopathy

DefinitionDiabetic retinopathy is a microvascular complication of diabetes affecting the retinal blood vessels.Risk FactorsDiabetic retinopathy is present in almost all individuals with type 1 diabetes and more than 60% of those with type 2 diabetes after two decades of disease.The risk increases with poor glycemic control, hypertension, dyslipidemia, smoking, pregnancy, and puberty.Although cataracts and glaucoma are also more frequent in people with diabetes, retinopathy remains the leading...
Glaucoma: Overview01:25

Glaucoma: Overview

Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...