Ophthalmology residents (post-graduate years 2-4) from 11 institutions were invited to participate. Participating residents were taught esotropia and exotropia topics sequentially, randomized by order and classroom style (flipped classroom vs. traditional lecture) one to three weeks apart. Participants were assigned a pre-class video lecture prior to the flipped classroom in-class case-based activity. The traditional classroom included a preparatory reading assignment and an in-person lecture delivered by the same instructor. Participants completed three identical 5-question content assessments (pre-test, post-test, and 3-month retention) and opinion surveys following each classroom.
