Table 2.

Association Between Binocular Visual Field Impairment and Rates of At-Fault Crashes for the Overall Field, by Region in the Field, and by the Number of Test Targets That Were Impaired

	Crude RR (95% CI)	Adjusted RR* (95% CI)	P Value
Overall field	1.83 (1.45–2.33)	1.40 (1.07–1.83)	0.014
Upper field	1.57 (1.23–2.01)	1.10 (0.83–1.44)	0.51
Horizontal meridian	1.78 (1.40–2.26)	1.31 (1.00–1.72)	0.048
Lower field	1.85 (1.46–2.34)	1.40 (1.07–1.82)	0.014
Left side	1.96 (1.55–2.48)	1.49 (1.15–1.92)	0.0024
Vertical meridian	1.68 (1.32–2.13)	1.26 (0.97–1.64)	0.078
Right side	1.64 (1.29–2.10)	1.16 (0.88–1.53)	0.28
Number of test target locations with impairment
0 (reference)	1.0	1.0
1–2	0.83 (0.59–1.18)	0.77 (0.54–1.10)	0.15
3–6	1.43 (1.05–1.95)	1.19 (0.86–1.64)	0.29
7–21	2.13 (1.59–2.86)	1.51 (1.08–2.12)	0.016

All models were adjusted for annual mileage.

^* Adjusted for age, sex, race, visual acuity, contrast sensitivity, MMSE, number of medical conditions, and Useful Field of View.