Vision, Driving Exposure, and Collisions in Bioptic Drivers

Area of Science:

• Ophthalmology and Vision Science
• Road Safety Research
• Rehabilitation Engineering

Background:

• Understanding the driving patterns and safety of individuals with low vision using bioptic telescopes is crucial for assessing their road safety.
• Limited data exists on the mileage driven by bioptic drivers and its correlation with vision impairment and collision rates.

Purpose of the Study:

• To investigate the relationship between visual factors (visual acuity, contrast sensitivity, visual field) and demographic factors with mileage driven in bioptic drivers.
• To determine the per-mile motor vehicle collision rate for bioptic drivers.
• To compare the collision rate of bioptic drivers with the general population.

Main Methods:

• Retrospective collection of driver data from clinic records and collision data from the Ohio Bureau of Motor Vehicles.
• Bioptic drivers reported their estimated annual mileage.
• Regression models were employed to analyze the associations between vision metrics and collision rates.

Main Results:

• Seventy-three bioptic drivers were included; mean age was 51 years, mean logMAR visual acuity was 0.67 (approx. 20/100).
• Poorer visual acuity was inversely related to mileage driven. Better contrast sensitivity and a wider visual field were associated with higher mileage.
• Poorer visual acuity and a narrower visual field were significantly associated with a higher number of collisions.

Conclusions:

• Visual acuity, visual field, and contrast sensitivity are associated with driving exposure and collision rates in bioptic drivers.
• Drivers with poorer vision reported lower annual mileage, and worse visual acuity and visual field were linked to increased collisions.
• The per-mile collision rate for bioptic drivers was comparable to, though slightly higher than, expected for fully sighted drivers.