Patients with homonymous hemianopia (HH) often fail to meet visual field (VF) requirements for a driver's license. We describe 2 patients with complete HH, who met the minimum VF requirements for driving using a novel, high-power, monocular sector prism system. Baseline VFs were assessed using automated and kinetic perimetry. Patients were fitted with glasses and press-on 57-PD peripheral monocular sector prisms placed on the lens ipsilateral to the VF defect above and below the visual axis with prisms oriented obliquely. Kinetic perimetry was reassessed both monocularly and binocularly, with and without prisms. The 2 patients had 95° and 82° angle of continuous, horizontal, binocular VF. With the use of the prism system, the binocular VF increased to 115° and 112° angles. Both patients reported improvement in quality of life and each holds a valid driver's license and has successfully operated a motor vehicle without any restrictions or accidents. These findings suggest that the addition of oblique 57-PD prisms to the ipsilateral spectacle lens above and below the visual axis for patients with complete HH can significantly increase horizontal VF, which may help an individual become visually qualified to obtain a driver's license.
Department of Ophthalmology and Visual Neurosciences, University of Minnesota School of Medicine, Minneapolis, Minnesota.
Address correspondence to Michael S. Lee, MD, Neuro-Ophthalmology Service, University of Minnesota School of Medicine, 420 Delaware Street, SE, MMC 493, Minneapolis, MN 55455-0501; E-mail: firstname.lastname@example.org
The authors report no conflicts of interest.
Supported in part by an unrestricted grant to the University of Minnesota, Department of Ophthalmology and Visual Neurosciences from Research to Prevent Blindness.