title: Effect of bilateral superior oblique split lengthening on torsion.
abstract: BACKGROUND
  Superior oblique split lengthening (SOSL) is done for weakening of superior oblique. It corrects the superior oblique overaction (SOOA) and A pattern. Its effect on the torsion of the eye is not known. We present our data on the effect of this particular procedure on torsion.
  
  
  METHODS
  We did a study of 16 patients (32 eyes) who underwent bilateral SOSL and compared the disc foveal angle (DFA) preoperatively and postoperatively. The split lengthening was done from 4 mm to 7 mm depending upon the overaction of superior oblique.
  
  
  RESULTS
  The mean age was 15.3 ± 8.4 years. Mean preoperative DFA in the right eye (RE) was -3.9° and in the left eye (LE) was -2.9°. Mean postoperative DFA in RE was 0.2° and in LE was 0.9°. The mean change in the DFA for RE was 4.1° ± 1.3° and for LE was 3.8° ± 1.2°. All the patients were aligned horizontally within 6 prism diopter and no pattern and no diplopia postoperatively. The A pattern was corrected in all the patient postsurgery. For each mm of surgery, an improvement of 0.8° was seen in the DFA.
  
  
  CONCLUSIONS
  We report the effect of SOSL on torsion. The SOSL reduces intorsion postsurgery and is, therefore, a valuable procedure in SOOA where both pattern and in torsion needs to be corrected.
authors.affiliation: Department of Pediatric Ophthalmology and Strabismus, Dr. Thakorbhai V Patel Eye Hospital, Vadodara, Gujarat, India.
authors.forename: Jitendra
authors.initials: J
authors.lastname: Jethani
authors.forename: Kuntal
authors.initials: K
authors.lastname: Shah
authors.forename: Sonal
authors.initials: S
authors.lastname: Amin
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D005133:Eye Movements / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D015835:Ocular Motility Disorders / Q000175:diagnosis / Q000503:physiopathology / Q000601:surgery*; D009801:Oculomotor Muscles / Q000503:physiopathology / Q000601:surgery*; D013508:Ophthalmologic Surgical Procedures / Q000379:methods*; D013536:Suture Techniques / Q000295:instrumentation*; D013537:Sutures; D055815:Young Adult