June 2023
Volume 64, Issue 8
Open Access
ARVO Annual Meeting Abstract  |   June 2023
Eye-only and eye-with-head scans of drivers with hemianopia at intersections
Author Affiliations & Notes
  • Ankit Kumar Yadav
    Schepens Eye Research Institute of Massachusetts Eye and Ear, Boston, Massachusetts, United States
    Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts, United States
  • Steven W. Savage
    Schepens Eye Research Institute of Massachusetts Eye and Ear, Boston, Massachusetts, United States
  • Lily Zhang
    Schepens Eye Research Institute of Massachusetts Eye and Ear, Boston, Massachusetts, United States
  • Garrett Swan
    Schepens Eye Research Institute of Massachusetts Eye and Ear, Boston, Massachusetts, United States
  • Alex R Bowers
    Schepens Eye Research Institute of Massachusetts Eye and Ear, Boston, Massachusetts, United States
    Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts, United States
  • Footnotes
    Commercial Relationships   Ankit Yadav None; Steven Savage None; Lily Zhang None; Garrett Swan None; Alex Bowers None
  • Footnotes
    Support  NIH Grants R01-EY025677, S10-RR028122, P30-EY003790
Investigative Ophthalmology & Visual Science June 2023, Vol.64, 1987. doi:
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    • Get Citation

      Ankit Kumar Yadav, Steven W. Savage, Lily Zhang, Garrett Swan, Alex R Bowers; Eye-only and eye-with-head scans of drivers with hemianopia at intersections. Invest. Ophthalmol. Vis. Sci. 2023;64(8):1987.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose : Drivers with homonymous hemianopia (HH) may compensate for their hemifield loss by scanning. Prior research has mostly quantified scanning in terms of overall gaze (combination of eye and head movements) or just head movements, failing to account for potential differences between eye-only scans (scans without any head movement) and eye-with-head scans (scans with head movement). We evaluated whether drivers with HH demonstrated compensatory behaviors in eye-only and/or eye-with-head scans when approaching intersections and examined driver and environmental factors affecting scanning behaviors.

Methods : 26 drivers (7 with left HH (LHH), 6 with right HH (RHH), and 13 age-matched with normal vision (NV)) drove in a high-fidelity driving simulator while eye and head movements were recorded. Scanning was analyzed on approach to 36 intersections in an urban environment with cross-traffic. The scans were classified into eye-only and eye-with-head scans. The effects of driver attributes and intersection characteristics were examined using linear mixed models and analysis of variance.

Results : Per intersection, drivers made 5.4 eye-only scans of magnitude 11.4°, and 2.5 eye-with-head scans of magnitude 42.1°. Scan magnitudes increased as drivers came closer to the intersection (p < 0.001) and decreased with increasing age of the driver (p = 0.023). RHH drivers made more eye-only scans than NV drivers (6.64 vs 4.58, p = 0.06) while LHH drivers tended to make more eye-with-head scans than NV drivers (2.82 vs 2.42, p = 0.11). HH drivers made significantly more scans to the blind than seeing side (eye-only: 2.62 vs 2.27, p = 0.001; eye-with-head: 1.26 vs 1.09, p < 0.001), suggesting compensatory behavior. Overall, there was no evidence of compensatory behaviors in scan magnitudes for either eye-only or eye-with-head scans: HH drivers made smaller (not larger) scans to the blind than seeing side (eye-only: 10.4° vs 11.5°, p < 0.001; eye-with-head: 37.7° vs. 40.7°, p = 0.03).

Conclusions : HH drivers showed evidence of compensatory behaviors in scan numbers, making more scans than NV drivers and more eye-only and eye-with-head scans to the blind than seeing side, but no evidence of compensatory behaviors in scan magnitudes. Smaller eye-only and eye-with-head scans to the blind side may be due to lack of guidance from peripheral vision on that side.

This abstract was presented at the 2023 ARVO Annual Meeting, held in New Orleans, LA, April 23-27, 2023.

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