Hayne DP, et al. - Recruiting 491 participants (411 female, 80 male) through Griffith University (AUS), Headache Australia, Pain Australia, and through social media, researchers investigated a potential association between visual factors and symptoms related to migraine. They examined if photophobia and visual aura would be positively associated with interictal light sensitivity and visual headache triggers (flicker, glare, and eyestrain) and that these 2 visual symptoms would also be associated. Participants were grouped based on the presence of headache disorder symptoms and the presence or absence of photophobia and/or visual aura. With respect to interictal light sensitivity and photophobia, they identified a significant difference between the 3 groups, headache disorder participants with photophobia (group A1) reported significantly greater light sensitivity than participants with headache disorder and no photophobia (A2) and control group participants (A3). Repeatition of this pattern was noted for participants reporting flicker as a headache trigger, and for those reporting glare as a headache trigger, with group A1 significantly higher than A2 and A3. Findings thus support an association between certain visual phenomena in headache disorder populations.