Fig. 6. Anatomic relation of extraocular muscle origins and insertions in straight-ahead gaze. Viewed binocularly from anterior and superior perspectives, and for the right eye only from the lateral (lower left) and medial (lower right) perspectives. Red saturation reflects total muscle tension. IO, inferior oblique; IR, inferior rectus; LR, lateral rectus; MR, medial rectus; SO, superior oblique; SR, superior rectus. (Image rendered using Orbit 1.8.)