Congratulations to the winner of our November quiz, P. Tandava Krishnan, MS, Research cum Clinical Fellow, Vitreo-retinal Services, Sankara Nethralaya, Chennai, India. The correct answer to our November challenge was Y-pattern exotropia due to rectus pulley instability. For a complete discussion of this case, see the Letters: Research Letters section in the December Archives (Heo H, Lee SH, Yoon KC, Park YG, Park SW. Rectus pulley instability as a cause of Y-pattern exotropia revealed by magnetic resonance imaging. Arch Ophthalmol. 2008;126:1776-1778).