OPN4 and dry age related macular degeneration: Previous studies have used patients classified as intermediary dry AMD (AREDS 2 and 3) and focused on the melanopsin-driven ipRGC responses using other patterns of stimuli, whereas our study was the first to use the evaluation protocol developed by Park et al. (2011) to assess rod, cone, and melanopsin-driven ipRGC responses on patients with early dry AMD (AREDS 2).