 Symptom frequency while reading appears to vary with a persons sensitivity to the striped pattern Conlon et al., 1998 and is more common among those who suffer from headaches or migraines Wilkins et al, 1984; Conlon et al., 1999. Effective reading time is considerably reduced by visual discomfort symptoms Conlon et al, 1998; Conlon et al, 1999, Wilkins, 2003. Most college students with visual discomfort cannot read for more than an hour at a time without taking a break Conlon et al., 1999. 