title: [Clinical features of V patterns strabismus and its long-term effect of surgical treatment].
abstract: OBJECTIVE
  To investigate the features and treatment of V patterns strabismus.
  
  
  METHODS
  Pre- and post-operative deviation and oblique muscle action as well as binocular visual function were evaluated in sixty-three V pattern patients. The difference between upgaze and downgaze of deviation were recorded before and after operation.
  
  
  RESULTS
  Sixty-two patients (98.4%) with binocular or unilateral inferior oblique overaction + 2 to + 3 were treated with inferior oblique weakening procedure and horizontal rectus recession-resection procedure. 1 patient with binocular inferior oblique overaction + 1 treated with horizontal recti recession-resection procedure. The difference between upgaze and downgaze is 25.6 prism diopters (PD) preoperatively and 4.5 PD postoperatively. The primary-position exotropia preoperatively of 48 V pattern exotropia is 37.2 PD, after surgery, the average deviation is 3.4 PD of esotropia [38 cases (79.2%) with deviation within +/- 10 PD]. 15 cases of V pattern esotropia had deviation 50.6 PD preoperatively, after surgery, the average deviation is 2.4 PD of esotropia [11 cases (73.3%) with deviation within 10 PD]. 21 patients (33.3%) obtained stereo visual function after surgery.
  
  
  CONCLUSIONS
  V patterns always had inferior oblique over action and could be treated with the inferior oblique weakening procedure. The primary-position deviation should be treated by traditional horizontal rectus recession-resection procedure. The stereoscopic function had a good prognosis with surgery.
authors.affiliation: Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou 510060, China.
authors.forename: Xin-ping
authors.initials: XP
authors.lastname: Yu
authors.forename: Guang-huan
authors.initials: GH
authors.lastname: Mai
authors.forename: Huan-yun
authors.initials: HY
authors.lastname: Yu
authors.forename: Jing-chang
authors.initials: JC
authors.lastname: Chen
authors.forename: Da-ming
authors.initials: DM
authors.lastname: Deng
authors.forename: Xiao-ming
authors.initials: XM
authors.lastname: Lin
authors.forename: He-ping
authors.initials: HP
authors.lastname: Wu
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D003867:Depth Perception / Q000502:physiology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007223:Infant; D008297:Male; D009801:Oculomotor Muscles / Q000503:physiopathology / Q000601:surgery*; D013508:Ophthalmologic Surgical Procedures / Q000379:methods; D012189:Retrospective Studies; D013285:Strabismus / Q000503:physiopathology / Q000601:surgery*; D016896:Treatment Outcome; D015348:Vision, Binocular / Q000502:physiology