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Related Concept Videos

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 end"...
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Prosopagnosia

Prosopagnosia, also known as face blindness, is the inability to recognize faces. In severe cases, individuals with prosopagnosia may not recognize close family members, including parents and spouses, by their faces. For instance, someone with prosopagnosia might walk past their child in a crowd, only realizing their mistake upon noticing their child's distinctive backpack or favorite jacket. Prosopagnosia specifically impairs facial recognition, while the recognition of other objects or...
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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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Vision01:24

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Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
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Related Experiment Video

Updated: May 14, 2026

Driving Simulation in the Clinic: Testing Visual Exploratory Behavior in Daily Life Activities in Patients with Visual Field Defects
11:12

Driving Simulation in the Clinic: Testing Visual Exploratory Behavior in Daily Life Activities in Patients with Visual Field Defects

Published on: September 18, 2012

Homonymous hemianopsia.

Iwona Obuchowska1, Zofia Mariak

  • 1Department of Ophthalmology, Medical University of Białystok, Poland. iwonaobu@wp.pl

Klinika Oczna
|February 5, 2013
PubMed
Summary

Homonymous hemianopia (HH) is a visual field loss impacting daily life. Rehabilitation, including optical and eye movement therapies, is key for managing this condition.

Area of Science:

  • Neuroscience
  • Ophthalmology

Background:

  • Homonymous hemianopia (HH) is a visual field defect affecting half of the visual field in both eyes.
  • It stems from damage to the suprachiasmatic visual pathway, caused by conditions like stroke, tumors, or injury.
  • HH causes significant visual impairment, impacting reading, spatial awareness, and leading to accidents.

Purpose of the Study:

  • To outline the causes and consequences of homonymous hemianopia.
  • To discuss the variable prognosis of visual field recovery.
  • To detail the rehabilitation strategies for managing HH patients.

Main Methods:

  • Review of existing literature on homonymous hemianopia.
  • Categorization of rehabilitation techniques into optical therapies, eye movement-based therapies, and visual field restitution therapies.

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Published on: July 21, 2020

Related Experiment Videos

Last Updated: May 14, 2026

Driving Simulation in the Clinic: Testing Visual Exploratory Behavior in Daily Life Activities in Patients with Visual Field Defects
11:12

Driving Simulation in the Clinic: Testing Visual Exploratory Behavior in Daily Life Activities in Patients with Visual Field Defects

Published on: September 18, 2012

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
07:45

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

Published on: July 21, 2020

Main Results:

  • HH significantly impairs visual functions, affecting daily activities and safety.
  • Prognosis for visual field recovery is highly variable, depending on injury severity and cause.
  • Rehabilitation is the primary management strategy for HH.

Conclusions:

  • Effective management of homonymous hemianopia relies on tailored rehabilitation approaches.
  • Optical, eye movement, and visual field restitution therapies offer potential for improving function.
  • Further research into optimizing HH rehabilitation strategies is warranted.