title: Hazard Detection by Drivers with Paracentral Homonymous Field Loss: A Small Case Series.
abstract: BACKGROUND
  Stroke frequently causes homonymous visual field loss. We previously found in a driving simulator that patients with complete homonymous hemianopia had difficulty detecting potential hazards on the side of the field loss. Here we measured the effects of limited paracentral homonymous field loss on detection performance.
  
  
  METHODS
  Three patients with paracentral homonymous scotomas, yet meeting vision requirements for driving in the United States, performed a pedestrian detection task while driving in a simulator. Pedestrians appeared in a variety of potentially hazardous situations on both sides of the road. Three age- and gender-matched control participants with normal vision participated for comparison purposes.
  
  
  RESULTS
  Pedestrians appearing in the scotomatous side of the visual field were less likely to be detected, and when they were, reaction times were longer, frequently too late to respond safely.
  
  
  CONCLUSIONS
  Although legally permitted to drive in the U.S.A., and possibly in other countries, patients with paracentral homonymous field loss may have impaired hazard detection and may benefit from education about their deficit and a fitness-to-drive evaluation.
authors: Bronstad P
authors: BP
authors: Matthew
authors: Alex R
authors: AR
authors: Bowers
authors: Amanda
authors: A
authors: Albu
authors: Robert B
authors: RB
authors: Goldstein
authors: Eli
authors: E
authors: Peli
keywords: Low vision; driver licensing; hemianopsia; quadranopia; quadranopsia; quadrantanopia; sectoranopia