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The Parks 3-step test is an important test in the diagnosis of a single cyclovertical muscle palsy. This video is presented to provide a simplified and easy understanding of the Parks 3-step test for post-graduate residents. The video contains a description of the steps to perform a 3-step test, the results of the test in a case of superior oblique palsy, the conditions that mimic a positive 3-step test, and how to identify these mimicking conditions. This is a simple demonstration of a classic clinical diagnostic procedure. https/