Table 2. Comparison of various visual function measures and person variables between the patients with and without a history of MVCs.

	MVC+ (mean ±s.d.)	MVC- (mean ±s.d.)	p value
Age	62.1±10.6	64.1±10.5	0.64
Better VA (LogMar)	0.000±0.000	0.004±0.020	0.036*
Worse VA (LogMar)	0.010±0.020	0.020±0.040	0.60
Gender (male∶female)	37∶14	135∶61	0.86
Distance driven per week (km)	148.2±204.6	73.2±121.2	0.14
IVF MD (dB)	−0.6±3.4	−0.8±3.7	0.67
Better MD (dB)	−3.0±3.8	−2.5±4.0	0.68
Worse MD (dB)	−8.1±7.3	−6.9±6.3	0.64
Better eye glaucoma severity# (0/1/2/3 or more)	6/37/5/3 (11.8%/72.5%/9.8%/5.9%)	40/129/18/9 (20.4%/65.8%/9.2%/4.6%)	0.86
Worse eye glaucoma severity# (0/1/2/3 or more)	1/24/12/14 (2.0%/47.1%/23.5%/27.4%)	5/107/48/36 (2.6%/54.6%/24.5%/18.3%)	0.86
Avoid night	12 (23.5)	64 (32.7)	0.64
Avoid rain	6 (11.8)	43 (21.9)	0.61
Avoid fog	7 (13.7)	32 (16.3)	0.86
Avoid highway	4 (7.8)	31 (15.8)	0.64
Avoid high speed	25 (49.0)	111 (56.6)	0.67
Avoid lane change	6 (11.8)	24 (12.2)	0.93
Car distance	25 (49.0)	90 (45.9)	0.86
Person parameter	−0.3±1.6	−0.6±1.5	0.61

^#Glaucoma severity was categorized using Mills Glaucoma Staging system [20].

Chi square test was used for the variable of gender and unpaired t-test was used for other comparisons.

*represents p<0.05 with Benjamini's correction [44].

Abbreviations.

s.d.: standard deviation, VA: visual acuity, LogMar: the logarithm of the minimum angle of resolution, MD: mean deviation, IVF: integrated visual field, TD: total deviation, MVC: motor vehicle collision, Person parameter: Rasch analysis derived index of paying attention to avoid traffic accident.