Table 1.

Internal consistency measured with Cronbach’s alpha for each outcome variable in the patient and control group.

Group	Outcome Measure	Cronbach’s α
Patient	Percentage fixation count	0.750
	Pupil diameter	0.802
	Average fixation duration	0.644
	First fixation time	0.722
Control	Percentage fixation count	0.927
	Pupil diameter	0.743
	Average fixation duration	0.616
	First fixation time	0.725