Use of Prisms for Navigation and Driving in Hemianopic Patients

This article reports on a study of the use of prisms for navigation and driving in patients with hemianopsia (loss of half the field of vision). The authors compared the outcomes of orientation and mobility and driving training with Fresnel prisms and the Gottlieb Visual Field Awareness System in 10 male patients with homonymous hemianopsia. The patients were provided with a rehabilitation program where they were fitted with prism lenses and trained to use them for navigation and driving; they were followed up for 2 years. Results showed that patients with hemianopic loss showed improvements in all of the visual skills categories, ranging from the highest improvements of 26% of tasks improved in the mobility category to 13% in the recognition category. The majority of the patients reported using the devices at the 2-year follow up interview. The authors conclude that prism lens systems can be useful to patients with compromised vision for improving navigation and mobility. They caution, however, that there is as yet no data on the long-term safety of device use while driving for any of these patients.

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  • Authors:
    • Szlyk, Janet P
    • Seiple, William
    • Stelmack, Joan
    • McMahon, Timothy
  • Publication Date: 2005-3


  • English

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  • Accession Number: 01003052
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 17 2005 10:58AM