Glaucomatous visual fields and neurocognitive function are independently associated with poor lane maintenance during...

Area of Science:

• Ophthalmology
• Neuroscience
• Human Factors Engineering

Background:

• Glaucoma is a leading cause of vision loss, impacting driving ability.
• Driving simulators offer a safe environment to study driving behavior in individuals with glaucoma.
• Previous research links visual field loss severity to increased crash risk in simulators, but underlying mechanisms are unclear.

Purpose of the Study:

• To investigate the relationship between visual field loss severity and neurocognitive performance in glaucoma drivers.
• To evaluate how these factors interact to affect simulated driving control.

Main Methods:

• Recruited 25 glaucoma patients and 18 glaucoma suspects with good visual acuity.
• Assessed binocular visual field index (OU-VFI), global and domain-specific neurocognitive function (Montreal Cognitive Assessment - MoCA), and vision/driving difficulties (NEI-VFQ).
• Measured driving performance using a simulator, analyzing steering wheel and lateral acceleration variability.

Main Results:

• Glaucoma patients demonstrated significantly greater steering wheel and lateral acceleration variability compared to suspects.
• Worse steering wheel variability was independently associated with greater visual field loss (OU-VFI), lower MoCA scores, and poorer NEI-VFQ driving sub-scores.
• Neurocognitive performance, specifically visuo-spatial and executive functions, correlated with visual field loss severity.

Conclusions:

• Impaired vehicle control in glaucoma is independently linked to both visual field loss and diminished neurocognitive function.
• These findings support information processing models of driving performance in glaucoma.
• Further research is needed to confirm the external validity of these simulator findings to real-world driving.