“…Several of these studies have additionally identified significant correlations between visual field loss and certain migraine features such as migraine frequency (De Natale et al, 1993;McKendrick and Badcock, 2004a;Nizankowska et al, 1997;Yenice et al, 2006), cumulative migraine history (McKendrick and Badcock, 2004a), and duration of worst headache (Harle and Evans, 2005), even if group differences in visual field performance were not found (Harle and Evans, 2005). Similarly, while there are no compelling group differences in structural retinal measures using the OCT, significant inverse relationships have been reported between retinal nerve fibre layer thickness and frequency of attacks (Martinez et al, 2009), duration of migraine history (Yulek et al, 2015), and severity of migraine (Martinez et al, 2009) as estimated by the Migraine Disability Assessment (MIDAS) questionnaire score (Lipton et al, 2001b;Stewart et al, 2001). These significant correlations raise the possibility that migraine may be associated with cumulative damage over time.…”