Fig. 7 A 7-year-old child with a right sixth-nerve palsy after head trauma. Top row. Eight weeks after head trauma and prior to botulinum A toxin injection. Note significant restriction to abduction of the right eye. Middle row. Four weeks after botulinum A toxin injection into the right medial rectus muscle. Note mild ptosis of the right upper lid and severe restriction of adduction of the right eye. Lateral rectus function has already improved significantly. Bottom row. Three months after botulinum A toxin injection, the patient's esotropia has resolved and medial and lateral rectus function are now normal.