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Related Concept Videos

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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...
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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 end"...
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Related Experiment Video

Updated: May 21, 2026

An Automated Method for Assessing Visual Acuity in Infants and Toddlers Using an Eye-Tracking System
05:10

An Automated Method for Assessing Visual Acuity in Infants and Toddlers Using an Eye-Tracking System

Published on: March 17, 2023

Nonorganic visual loss in children.

Quianta Moore1, Nagham Al-Zubidi, Sushma Yalamanchili

  • 1Baylor College of Medicine, 1977 Butler Boulevard, Houston, TX 77030, USA.

International Ophthalmology Clinics
|June 7, 2012
PubMed
Summary

Nonorganic vision loss (NOVL) in children is common, with variable causes including abuse. Diagnosis requires careful examination, and reassurance is often sufficient treatment for this functional vision problem.

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Last Updated: May 21, 2026

An Automated Method for Assessing Visual Acuity in Infants and Toddlers Using an Eye-Tracking System
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Published on: March 17, 2023

Electroretinogram Recording for Infants and Children under Anesthesia to Achieve Optimal Dark Adaptation and International Standards
08:38

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A Method to Quantify Visual Information Processing in Children Using Eye Tracking
09:47

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

Published on: July 9, 2016

Area of Science:

  • Ophthalmology
  • Pediatrics
  • Psychology

Background:

  • Nonorganic vision loss (NOVL) is a frequent challenge encountered by pediatric ophthalmologists.
  • While etiologies vary, rare instances are linked to physical or sexual abuse.
  • Accurate diagnosis is crucial, with 'nonorganic' being the preferred terminology.

Purpose of the Study:

  • To outline diagnostic approaches for NOVL in children.
  • To emphasize the importance of a thorough eye examination.
  • To discuss management strategies for NOVL.

Main Methods:

  • Clinical examination to assess visual function.
  • Exclusion of organic eye disease.
  • Consideration of electrophysiological testing when clinical diagnosis is uncertain.

Main Results:

  • NOVL is common in pediatric ophthalmology practice.
  • Careful clinical evaluation is key to diagnosis, ensuring vision is better than reported.
  • Electrophysiology may aid diagnosis in challenging cases.

Conclusions:

  • Most children with NOVL benefit from reassurance.
  • Psychiatric evaluation may be indicated for some patients.
  • Co-existing organic and nonorganic vision issues are common and should be considered.