Driving with central field loss III: vehicle control

Area of Science:

• Ophthalmology
• Human Factors Engineering
• Transportation Safety

Background:

• Central field loss significantly impairs vision, potentially complicating vehicle control due to a reduced view of the road.
• Understanding the impact of visual field deficits on driving performance is crucial for road safety.

Purpose of the Study:

• To evaluate the effects of central field loss on vehicle control performance in a driving simulator.
• To compare driving performance metrics between individuals with central field loss and those with normal vision.

Main Methods:

• Nineteen participants with binocular central field loss and 15 controls completed 10 driving scenarios in a simulator.
• Key metrics included speed, lane offset, steering wheel reversal rate, and following distance across various road types and speeds.
• Data were collected on city and rural highway routes.

Main Results:

• Participants with central field loss exhibited significantly higher steering wheel reversal rates, indicating more frequent steering adjustments.
• No significant differences were observed in other primary performance measures like speed or lane offset.
• While maintaining safe following distances, those with central field loss were more likely to lose sight of the lead vehicle.

Conclusions:

• Despite comparable performance in most metrics, increased steering corrections suggest drivers with central field loss expend greater effort to maintain lane position.
• This heightened steering effort may divert attentional resources from other critical driving tasks.
• The findings highlight the complex compensatory strategies employed by drivers with central field loss.