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Photoreceptors and Visual Pathways01:22

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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,...
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  11. The Prevalence And Causes Of Visual Impairment In Special Schools And Blind Schools In Shanxi Province, China: A Cross-sectional Study.
  1. Home
  3. Research Domains
  5. Education
  7. Specialist Studies In Education
  9. Special Education And Disability
  11. The Prevalence And Causes Of Visual Impairment In Special Schools And Blind Schools In Shanxi Province, China: A Cross-sectional Study.

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The prevalence and causes of visual impairment in special schools and blind schools in Shanxi Province, China: a cross-sectional study.

Fengchao Zhou1, Tianfeng Feng2, Ge Bai2

  • 1Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing, 100730, China.

Scientific Reports
|July 11, 2025

View abstract on PubMed

Summary
This summary is machine-generated.

Low vision and blindness are prevalent in Chinese special education students, mainly due to uncorrected refractive errors. Many cases are avoidable, emphasizing the need for early screening and interventions for children with disabilities.

Keywords:
Blind schoolBlindnessLow visionSpecial school

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Area of Science:

  • Ophthalmology
  • Public Health
  • Pediatrics

Background:

  • Visual impairment poses a significant challenge for children with disabilities.
  • Understanding the prevalence and causes of visual impairment in special education settings is crucial for developing targeted interventions.

Purpose of the Study:

  • To determine the prevalence and causes of low vision and blindness among students in special education and blind schools in Shanxi Province, China.
  • To identify avoidable causes of visual impairment and inform public health strategies.

Main Methods:

  • A cross-sectional study was conducted in nine special education schools and two blind schools in Shanxi Province.
  • Comprehensive ophthalmic examinations, including visual acuity assessment and refraction, were performed on 441 special school students and 56 blind school students.
  • Visual impairment was classified using World Health Organization (WHO) criteria.

    • Main Results:

    • Among special school students, 10.0% had visual impairment, primarily due to uncorrected refractive errors (90.7%).
    • In blind schools/classes, 53.6% were blind and 39.3% were visually impaired.
    • A significant 44.6% of visual impairment cases were avoidable, with nystagmus, amblyopia, and cataract as leading causes.

    Conclusions:

    • Uncorrected refractive errors are a major cause of visual impairment in special schools.
    • Nystagmus is highly prevalent in blind schools, and a substantial portion of visual impairment is preventable.
    • Early screening and interventions are essential to improve visual function in children with disabilities.