title: Isolated cyclovertical muscle palsy: a simplified algorithm for interpreting the three-step test.
abstract: A simplified algorithm is presented for determining the palsied cyclovertical muscle, once the three-step test is completed. The examiner is required only to remember the three-step test characteristics of two muscles (right superior oblique, left inferior oblique) and the Knight's move in chess.
authors.forename: L N
authors.initials: LN
authors.lastname: Johnson
mesh_terms: D000465:Algorithms; D006801:Humans; D015840:Oculomotor Nerve Diseases / Q000175:diagnosis*; D014787:Vision Tests