Schematic showing the randomization of each participating institution to topic (esotropia and exotropia) as well as classroom style (flipped classroom and traditional lecture). The order of classes is also shown, with the top panel representing the first class and the bottom panel representing the second class. DMEI, Dean McGee Eye Institute at University of Oklahoma; Duke, Duke University; ET, esotropia; UCD, University of California at Davis; UW, University of Washington, Seattle. XT, exotropia.