Obstacle Avoidance, Visual Detection Performance, and Eye-Scanning Behavior of Glaucoma Patients in a Driving Simulator: A Preliminary Study

• Published in: PloS one Vol. 8; no. 10; p. e77294
• Main Authors: Prado Vega, Rocío, van Leeuwen, Peter M., Rendón Vélez, Elizabeth, Lemij, Hans G., de Winter, Joost C. F.
• Format: Journal Article
• Language: English
• Published: United States Public Library of Science 16.10.2013; Public Library of Science (PLoS)
• Subjects: Aged; Automobile Driving; Avoidance behavior; Biomechanics; Case-Control Studies; Computer Simulation; Control theory; Defects; Driving ability; Engineering; Eye; Female; Fixation, Ocular; Glaucoma; Glaucoma - physiopathology; Humans; Lane keeping; Male; Medical research; Middle Aged; Obstacle avoidance; Patients; Psychomotor Performance; Reaction Time; Reaction time task; Scanning; Statistical analysis; Steering; Studies; Surveys and Questionnaires; Traffic accidents & safety; Visual field; Visual Fields; Visual perception; Netherlands
• ISSN: 1932-6203; 1932-6203
• DOI: 10.1371/journal.pone.0077294

The objective of this study was to evaluate differences in driving performance, visual detection performance, and eye-scanning behavior between glaucoma patients and control participants without glaucoma. Glaucoma patients (n = 23) and control participants (n = 12) completed four 5-min driving sessions in a simulator. The participants were instructed to maintain the car in the right lane of a two-lane highway while their speed was automatically maintained at 100 km/h. Additional tasks per session were: Session 1: none, Session 2: verbalization of projected letters, Session 3: avoidance of static obstacles, and Session 4: combined letter verbalization and avoidance of static obstacles. Eye-scanning behavior was recorded with an eye-tracker. Results showed no statistically significant differences between patients and control participants for lane keeping, obstacle avoidance, and eye-scanning behavior. Steering activity, number of missed letters, and letter reaction time were significantly higher for glaucoma patients than for control participants. In conclusion, glaucoma patients were able to avoid objects and maintain a nominal lane keeping performance, but applied more steering input than control participants, and were more likely than control participants to miss peripherally projected stimuli. The eye-tracking results suggest that glaucoma patients did not use extra visual search to compensate for their visual field loss. Limitations of the study, such as small sample size, are discussed.