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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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Related Experiment Video

Updated: Jun 9, 2026

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

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Published on: September 18, 2012

Visual field expansion after visual restoration therapy.

Randolph S Marshall1, Mohamad Chmayssani, Katherine A O'Brien

  • 1Department of Neurology, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA. rsm2@columbia.edu

Clinical Rehabilitation
|August 31, 2010
PubMed
Summary
This summary is machine-generated.

Visual restoration therapy (VRT) showed modest visual field expansion in stroke patients. This improvement, measured by fundus-controlled microperimetry, is not attributed to eye movements, indicating a real treatment effect.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Rehabilitation Medicine

Background:

  • Stroke-induced homonymous field cuts significantly impair vision and quality of life.
  • Visual restoration therapy (VRT) is a home-based computerized treatment designed to address these visual field defects.
  • The efficacy of VRT, particularly regarding true visual field expansion versus artifact, remains a subject of investigation.

Purpose of the Study:

  • To objectively assess visual field expansion following Visual Restoration Therapy (VRT).
  • To differentiate true visual field gains from potential artifacts caused by eye movements.

Main Methods:

  • A longitudinal cohort study involving seven patients with stroke-induced homonymous field cuts.
  • Visual fields were assessed before and after a three-month VRT intervention using both standard high-resolution perimetry and fundus-controlled microperimetry.
  • Fundus-controlled microperimetry was employed to ensure accurate stimulus delivery to known retinal locations, independent of eye movements.

Main Results:

  • An average improvement of 12.5% in stimulus detection rate was observed using microperimetry (P=0.033).
  • Six out of seven patients demonstrated a clinically significant improvement (≥3%) in stimulus detection.
  • These improvements were validated by fundus-controlled microperimetry, mitigating concerns about eye movement artifacts.

Conclusions:

  • Visual restoration therapy leads to a modest but genuine expansion of visual fields in patients with homonymous hemianopia.
  • The observed visual field gains are not a result of compensatory eye movements, confirming the therapeutic effect of VRT.
  • Fundus-controlled microperimetry is a crucial tool for accurately evaluating visual field changes in VRT studies.