Related Experiment Video

Updated: Jan 23, 2026

Using the Visual World Paradigm to Study Sentence Comprehension in Mandarin-Speaking Children with Autism
06:15

Using the Visual World Paradigm to Study Sentence Comprehension in Mandarin-Speaking Children with Autism

Published on: October 3, 2018

8.1K

Visual problems: a review of prevalence studies on visual impairment in school-age children

Uchenna C Atowa1, Rekha Hansraj1, Samuel O Wajuihian1

  • 1Discipline of Optometry, University of KwaZulu-Natal, Durban 4000, South Africa.

International Journal of Ophthalmology
|June 26, 2019
PubMed

Insights

Childhood visual impairment (VI) significantly impacts education and social life, often stemming from preventable causes. Understanding global prevalence and causes is crucial for early detection and effective treatment strategies.

Area of Science:

  • Ophthalmology
  • Public Health
  • Pediatrics

Background:

  • Childhood visual impairment (VI) poses significant challenges to educational attainment, career prospects, and social integration.
  • A substantial proportion of VI in children arises from causes that are preventable or treatable, underscoring the need for early intervention.

Purpose of the Study:

  • To conduct a comprehensive literature review summarizing global data on the prevalence and etiological factors of VI in school-aged children.
  • To provide a foundation for developing systematic vision screening programs aimed at early detection and management of childhood VI.

Main Methods:

  • Systematic literature search for studies reporting on the prevalence and causes of VI in school-aged children across diverse geographical regions.
  • Analysis and synthesis of data from selected studies, focusing on definition criteria, classification of VI, and identified etiological factors.

Main Results:

  • The review synthesizes available global data on childhood VI prevalence and its primary causes.
  • Identifies variations in prevalence and etiological patterns across different regions.
  • Highlights inconsistencies in definition criteria and classification methods used in existing studies.

Conclusions:

  • Reliable data on the prevalence and causes of childhood VI are essential for implementing effective vision screening and intervention programs.
  • Further research is needed to standardize definitions and classifications to enable more robust global comparisons and targeted public health initiatives.
  • Addressing preventable and treatable causes of VI is critical for improving long-term outcomes for affected children.

Keywords:
school performanceschool-age childrenvision screeningvisual impairment

More Related Videos

Measuring Statistical Learning Across Modalities and Domains in School-Aged Children Via an Online Platform and Neuroimaging Techniques08:05

Measuring Statistical Learning Across Modalities and Domains in School-Aged Children Via an Online Platform and Neuroimaging Techniques

Published on: June 30, 2020

8.0K
A Method to Quantify Visual Information Processing in Children Using Eye Tracking09:47

A Method to Quantify Visual Information Processing in Children Using Eye Tracking

Published on: July 9, 2016

18.1K

Related Concept Videos

Prevalence and Incidence01:08

Prevalence and Incidence

In statistical epidemiology and health sciences, two essential metrics—prevalence and incidence—are fundamental for understanding disease dynamics within a population. These measures enable public health officials, epidemiologists, and researchers to assess the burden of diseases, allocate resources effectively, and design impactful public health policies and interventions.
Prevalence indicates the proportion of individuals in a population who have a specific disease or health...
1.6K
Visual System01:26

Visual System

Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...
1.7K
Visual Agnosia01:12

Visual Agnosia

Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round...
1.0K
Review and Preview01:10

Review and Preview

In statistics, several tools are used to interpret the data. Measures of central tendency represent the characteristics of the data, such as mean, median, and mode. Additionally, measures of variance like standard deviation and range are used to find the spread of data from the mean. Relative standing measures the distance between data locations. Commonly used measures of relative standings are percentile, z score, and quartiles.
Percentiles are a type of fractile that partition data into...
8.3K
Review and Preview01:13

Review and Preview

Data are individual items of information obtained from a population or sample. Data may be classified as qualitative (categorical), quantitative continuous, or quantitative discrete. Because it is not practical to measure the entire population in a study, researchers use samples to represent the population. A random sample is a representative group from the population chosen by using a method that gives each individual in the population an equal chance of being included in the sample. Random...
10.9K
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,...
8.9K