Hemianopsia is a blindness or reduction in vision in one half of the visual field. Hemianopsias can be caused by conditions such as stroke, tumors and trauma. The cause of a hemianopsia must always be carefully investigate by the patient's physicians. Hemianopsias may vary from an absolute loss of all vision on one side to a relative loss where vision is reduced, but not completely missing. Relative hemianopsias may vary from light or motion detection only in the impaired field to only subtle decreases in sensitivity demonstrated on careful visual field testing. The defect is called a homonymous hemianopsia when the field loss presents on the same side in both eyes. This is typical of stroke and patient suffering right or left arm or leg weakness may also present a homonymous hemianopsia on the same side of the weakness. Pure occiptal lobe stroke, affecting the part of the brain that processes vision may result in a homonymous hemianopsia without any other impairment or paralysis.

During the first few months after a stroke or trauma, some improvement in visual fields may be possible, but recovery depends on the extent of the damage. There are no specific treatments  to cure the field loss, but today we have optical devices and therapies  that help most patients compensate for their visual field loss. These optical systems include the Gottlieb Visual Field Awareness System, the Peli lens and various press-on field enhancers.

Image of GottliebThe application of a prism to enhance visual field has existed for many decades. However, the development of the Gottlieb Visual Field Awareness System has greatly improved our success rates in aiding patients after hemianoptic visual field loss. Gottlieb's novel approach was to abandon the traditional equal prism in each side in a straight line and rather place a small wafer of base out prism in a round shape on the side of the visual field loss. The idea is to shift the image into the patient's still functional field as the patient makes natural scanning movements.


Understanding Hemianopsia, an article recently published by Dr Laura and Richard Windsor



Patient Stories Stroke and Head Injury

Condense_black.gif (882 bytes)Stacey's Vision
Condense_black.gif (882 bytes)Hemi-Hell: My Husband's Struggle

Visual Field Systems After Brain Injury

Condense_black.gif (882 bytes)Gottlieb Visual Field Enhancement System
Condense_black.gif (882 bytes)
Press-on Visual Field Enhancement Prisms


Video Tapes


Order Our Videotape on Hemianopsia

Tape One:  Rehabilitation of Hemianopsia This is a great resource on hemianopsia. It was created by Dr. Richard Windsor, the founder of the Low Vision Gateway.  Order their new videotape Hemianopsia: New Approaches in Rehabilitation.

Tape Two:   Visual Field Awareness System This tape features DR. Windsor's work and is 90 second section from Breakthroughs in Science (317) 844-0919.


Related Hemianopsia Links on the Internet


Condensered.gif (846 bytes)Neuro-Optometric  Rehabilitation Hemianopsia Section 

Condensered.gif (846 bytes)Traumatic Brain Injury Act of 1992--S. 2949

Condensered.gif (846 bytes)NAA Aphasia Community Groups

Condensered.gif (846 bytes)National Aphasia Association

Condensered.gif (846 bytes)Brain Injury Guide

Condensered.gif (846 bytes)Brain Injury Glossary

Condensered.gif (846 bytes)Brain Injury Glossary H

Condensered.gif (846 bytes)Brain Injury Glossary D

Condensered.gif (846 bytes)Brain Injury Association USA Home Page

Condensered.gif (846 bytes)Brain Net

Condensered.gif (846 bytes)Ocular Motor Apraxia Web Site

Condensered.gif (846 bytes)National Ataxia Foundation Home Page

Condensered.gif (846 bytes)Ocular Motor Apraxia Web Site

Condensered.gif (846 bytes)Rancho Los Amigos Scale

Condensered.gif (846 bytes)NAA Regional and Area Representatives

Condensered.gif (846 bytes)NAA People Helping People

Condensered.gif (846 bytes)NAA Community Group Resources

Condensered.gif (846 bytes)NAA Caregiver Support

Condensered.gif (846 bytes)CNS NeuroLinks

Condensered.gif (846 bytes)Coma Waiting Page

Condensered.gif (846 bytes)Dizziness Explained

Condensered.gif (846 bytes)Glossary of Hearing and Balance Terms 

Condensered.gif (846 bytes)JHU Center for Hearing and Balance

Condensered.gif (846 bytes)Double Vision

Condensered.gif (846 bytes)Welcome to the CNS Home Page

Condensered.gif (846 bytes)MTBI Identification Checklist

Condensered.gif (846 bytes)Aphasia Hope Foundation



back.gif (3012 bytes)