@JeremyECrawford what about if the blinding is caused by fog Cloud, and they were right next to you when they cast it
— sebastian ferguson (@gaaran00b) September 16, 2015
W/o a special ability, you can't make an opportunity attack vs. a target you can't see, regardless of cause. #DnD https://t.co/9vte1Gx94v
— Jeremy Crawford (@JeremyECrawford) September 16, 2015