Congratulations to the winner of our October quiz, Juan D. Arias, MD, Oncology Service, Wills Eye Institute, Philadelphia, Pennsylvania. The correct answer to our October challenge was acute retinal necrosis following herpes zoster vaccination. For a complete discussion of this case, see the Small Case Series section in the November Archives (Charkoudian LD, Kaiser GM, Steinmetz RL, Srivastava SK. Acute retinal necrosis after herpes zoster vaccination. Arch Ophthalmol. 2011;129:1495-1497).