Related Experiment Video

Updated: Jan 17, 2026

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients
07:06

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients

Published on: March 29, 2022

3.2K

Uncorrected refractive errors, visual impairment and need for spectacles among children and adolescents in eastern,

Yue Zhou1, Qi Cai1, Xiaojuan Chen1

  • 1Department of Ophthalmology, Second Affiliated Hospital of Nantong University, Nantong, Jiangsu Province, China.

Plos One
|September 16, 2025
PubMed

Insights

Uncorrected refractive errors (URE) and the need for spectacles are high in Chinese youth, despite low visual impairment (VI) rates. Myopia is a key risk factor, highlighting the need for targeted interventions to prevent vision loss.

Area of Science:

  • Ophthalmology
  • Public Health
  • Pediatrics

Background:

  • Uncorrected refractive errors (URE) are a leading cause of preventable visual impairment (VI) in children globally.
  • China faces high myopia prevalence and insufficient spectacle coverage among youth.
  • Data on URE, VI, and spectacle needs in eastern China are scarce, especially concerning anisometropia.

Purpose of the Study:

  • To evaluate the prevalence of URE, VI, and the need for spectacles in children and adolescents in Nantong, China.
  • To identify risk factors associated with URE, VI, and spectacle needs, including anisometropia.
  • To inform targeted interventions for preventing visual impairment.

Main Methods:

  • A cross-sectional school-based study involving 9,438 participants aged 7-19 years in Nantong, China.
  • Assessment of uncorrected visual acuity, presenting visual acuity (PVA), and best-corrected visual acuity.
  • Non-cycloplegic autorefraction to define URE, VI, and spectacle needs.

Main Results:

  • The prevalence of URE was 15.7%, VI was 4.9%, and the need for spectacles was 55.9%.
  • Myopia, hyperopia, anisometropia, female sex, and older age were significant risk factors for URE and spectacle needs.
  • Myopia and rural residence were associated with VI.

Conclusions:

  • While VI prevalence was low, URE and spectacle needs were high among eastern Chinese youth.
  • Myopia is the primary risk factor for URE, VI, and spectacle needs; anisometropia also plays a significant role.
  • Intervention strategies require adjustment to eliminate preventable visual impairments.
Abstract

More Related Videos

Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter05:14

Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter

Published on: September 16, 2025

575
Subjective Refraction Test Using a Smartphone for Vision Screening05:36

Subjective Refraction Test Using a Smartphone for Vision Screening

Published on: October 18, 2024

1.7K

Related Concept Videos

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...
5.4K
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,...
8.8K
Accessory Structures of the Eye01:17

Accessory Structures of the Eye

Optical perception, or vision, is an extraordinary sense dependent on converting light signals received via the ocular organs. These organs, known as eyes, are securely positioned within the bony cavities of the skull, called orbits. The orbits serve a dual purpose: a protective shield for the ocular globes and a stable attachment point for the soft ocular tissues. The eye's external protective mechanisms include the eyelids, which are edged with lashes that act as a barrier against foreign...
3.4K