Table 1. Subject characteristics.

	ALS (n = 25)	Control (n = 25)	P*
Age (mean (range))	52.9 yrs (26–77)	53.3 yrs (35–72)	0.92 (t-test, t = 0.099)
Gender (female)	32% (8)	64% (16)	0.09 (Fisher’s exact)
Corrective lenses distance	36% (9)	68% (17)	0.15 (Fisher’s exact)
Corrective lenses near	52% (13)	72% (18)	0.56 (Fisher’s exact)
Additional refractive correction**	52% (13)	68% (17)	0.53 (Fisher’s exact)
ALSFRS-R (mean, range)	37.25 (15–48)
Symptom duration (mean, range))	2.5 yrs (0.2–7.7)
MMT (mean, range)	21.5 (0–73)

*t-test for continuous variables, chi square or fisher exact test for dichotomous variables

** correction provided in addition to habitual lenses following refraction protocol