Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Photoreceptors and Visual Pathways

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...

Visual Agnosia

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 end"...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Design of a card-based operational framework for the implementation of inclusive representation in clinical trials.

Trials·2026

Same author

Densities of CO<sub>2</sub>‑Loaded and Unloaded 3‑Amino-1-propanol Aqueous Solutions and Their Blends with 2‑Amino-2-methyl-1-propanol at High Pressures.

ACS omega·2025

Same author

Masking Mandate Policies and Community-Level Factors Associated with COVID-19 Cases Spread in the State of Texas.

Journal of racial and ethnic health disparities·2025

Same author

A stochastic programming model for trauma hospital network expansion considering rural communities and COVID-19.

Health care management science·2025

Same author

Optimizing access to fruits and vegetables in rural communities: A decision-making model for the placement of produce markets.

PloS one·2025

Same author

A SIMULATION-OPTIMIZATION APPROACH TO IMPROVE THE ALLOCATION OF SECURITY SCREENING RESOURCES IN AIRPORT TERMINAL CHECKPOINTS.

Proceedings of the ... Winter Simulation Conference. Winter Simulation Conference·2025

Search research articles

Related Experiment Video

Updated: Jun 19, 2026

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

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

Published on: March 17, 2023

Conversion visual loss: a differential diagnosis in infant amblyopia.

Carlos Laria¹, Maria Elena Perez, Eduardo Perez

¹Instituto Oftalmológico de Alicante, VISSUM, Alicante, Spain. Laria1@telefonica.net

European Journal of Ophthalmology

|November 3, 2009

Summary

This case study highlights a child

More Related Videos

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition

Published on: July 21, 2020

Related Experiment Videos

Last Updated: Jun 19, 2026

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

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

Published on: March 17, 2023

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition

Published on: July 21, 2020

Area of Science:

Pediatric Ophthalmology
Child Psychology
Neuroscience

Background:

Conversion disorders, a type of somatoform disorder, can manifest with diverse physical symptoms.
Psychogenic visual loss is rare in pediatric populations and often misdiagnosed.
Early identification and intervention are critical for managing conversion disorders.

Observation:

A 9-year-old girl presented with progressive bilateral blindness over six months.
The visual loss followed an episode of lumbar pain and was associated with severe visual field constriction.
Extensive medical workup ruled out organic causes for the visual impairment.

Findings:

The patient was diagnosed with a conversion disorder presenting as functional blindness.
Psychotherapy and a pharmacologic protocol led to complete visual recovery within six months.
Final visual acuity returned to 20/20 with normal visual fields.

Implications:

Conversion disorders represent an important, yet often overlooked, cause of pediatric visual loss.
A multidisciplinary approach involving ophthalmologists, psychologists, and neurologists is essential for accurate diagnosis and effective treatment.
Recognizing psychogenic visual disturbances can prevent unnecessary investigations and improve patient outcomes.