title: Transcaruncular orbital decompression for dysthyroid optic neuropathy.
abstract: OBJECTIVE
  To determine the efficacy of transcaruncular approach orbital apex decompression for treatment of dysthyroid optic neuropathy.
  
  
  METHODS
  In this retrospective noncomparative interventional case series, charts for all patients undergoing orbital decompression surgery for dysthyroid optic neuropathy performed by one author between October 1999 and September 2001 were included in the study. Primary outcome measures included visual acuity, static perimetry, pupillary testing, and color plate testing before and after surgery. Records were also reviewed for changes in extraocular motility and proptosis after surgery and for surgical complications.
  
  
  RESULTS
  Sixteen consecutive patients (6 unilateral, 10 bilateral, for a total of 26 cases) underwent orbital apex decompression for dysthyroid optic neuropathy through a transcaruncular approach. In each orbit, the optic neuropathy was refractory to oral corticosteroid therapy. Preoperative visual acuity remained stable or improved in each case. Preoperative Humphrey visual field testing revealed an average mean deviation of -10.3 +/- 6.5 (range, +0.76 to -25.45). Average postoperative mean deviation was -2.79 +/- 2.4 (range, +0.94 to -9.82). Before surgery, 7 of 23 eyes (30%) had full color plates. After surgery, 22 of 23 eyes (96%) had full color plates. Follow-up ranged from 2 to 26 months (mean, 10 months). New-onset diplopia developed in 2 of 10 (20%) patients without preexisting diplopia.
  
  
  CONCLUSIONS
  Transcaruncular approach orbital apex decompression effectively treats dysthyroid optic neuropathy.
mesh_terms: D000328:Adult; D000368:Aged; D019299:Decompression, Surgical / Q000379:methods*; D005260:Female; D006111:Graves Disease / Q000150:complications / Q000601:surgery*; D006801:Humans; D008297:Male; D008875:Middle Aged; D013508:Ophthalmologic Surgical Procedures / Q000379:methods*; D009901:Optic Nerve Diseases / Q000209:etiology / Q000601:surgery*; D009915:Orbit / Q000601:surgery*; D012189:Retrospective Studies; D016896:Treatment Outcome; D014792:Visual Acuity