We stayed in Israel for two weeks. I woke up on the morning of our departure, my right eye felt itchy. I shrugged it off, probably allergies. By the time we landed in Boston, my eye was swollen shut and weeping. The next evening, both eyes were itchy, and by the morning of me return home, both eyes were swollen. Opening them was painful, and when I did, all I could see was blurry shapes and colors.