title: Combined bilateral superior rectus muscle recession and inferior oblique muscle weakening for dissociated vertical deviation.
abstract: OBJECTIVE
  Dissociated vertical deviation (DVD) is a common disorder that is often difficult to treat satisfactorily with extraocular muscle surgery. Weakening both elevators in a single eye is uncommonly performed because of possible severe upgaze deficiency or chin-up head posture postoperatively.
  
  
  METHODS
  A retrospective review of medical records was performed that yielded 14 patients who had undergone bilateral superior rectus muscle recessions (mean 8.1 mm, range 5-10 mm) and bilateral inferior oblique muscle recession, myectomy, or anterior transposition in the treatment of DVD. Three additional patients with asymmetric inferior oblique muscle overaction or true hypertropia in primary gaze position were identified who had bilateral superior rectus muscle recessions combined with unilateral inferior oblique muscle weakening.
  
  
  RESULTS
  Mild-to-moderate elevation deficiencies were common postoperatively but never exceeded -2 up-gaze limitation (scale 0 to -4) except in the immediate postoperative period and were not associated with persistent chin-up head posturing. Cosmetically objectionable upper eyelid retraction occurred in one patient after re-recession of a superior rectus muscle but before inferior oblique muscle surgery. Only three patients undergoing four vertical muscle surgeries had residual DVD >10 PD in primary gaze position, and none exhibited manifest dissociated strabismus warranting further treatment.
  
  
  CONCLUSIONS
  Bilateral superior rectus muscle recession of up to 10 mm combined with inferior oblique muscle weakening appears to be a safe surgical approach in the management of patients with large angle or recurrent DVD. Our data further suggest that simultaneous four vertical muscle surgery may be preferred in some patients to weakening the superior rectus or inferior oblique muscles alone.
authors.affiliation: N. Edgar Miles Center for Pediatric Ophthalmology, Department of Ophthalmology, Medical University of South Carolina, Charleston 29425-2236, USA.
authors.forename: M M
authors.initials: MM
authors.lastname: Varn
authors.forename: R A
authors.initials: RA
authors.lastname: Saunders
authors.forename: M E
authors.initials: ME
authors.lastname: Wilson
mesh_terms: D003867:Depth Perception; D005500:Follow-Up Studies; D006801:Humans; D009801:Oculomotor Muscles / Q000601:surgery* / Q000637:transplantation; D012189:Retrospective Studies; D013285:Strabismus / Q000601:surgery*; D015348:Vision, Binocular