Analysis on efficacy of surgery for V patternstrabismus with oblique muscle dysfunction

Abstract

Objective To investigate the surgical efficacy of V pattern strabismus with oblique muscle dysfunction. Methods The medical records of 45 V pattern strabismus patients with oblique muscle dysfunction were retrospectively analyzed. The strabismus degree of the eye’s primary position was checked. The strabismus degree difference of the eyes turned up 25° and turned down 25° was compared. The eye movements, oblique muscle and binocular visual function were checked. The principle of surgery was that weakening the inferior oblique muscle, or combinning strengthened superior oblique muscle and/or weakened synergist muscle, and/or weakened antagonist muscle. The horizontal strabismus was corrected according to the primary eye position. The patients were followed-up for two months to two years after the surgery. Results The total postoperative alignment eyes position rate was 91.11% (41/45) and the V symptoms were disappeared in all cases. The inferior obliques overaction were obviously weakened after the surgery. The near stereo vision received 74.42% and improved on 11 patients in 43 cases. The preoperative near stereo vision of V pattern esotropia group was more obviously damaged than that of V pattern exotropia group(P <0.05). The postoperative recovery of the near stereo vision of the V pattern exotropia was more obviously earlier than that of the V pattern esotropia, the differences between the two groups were statistically significant(P <0.05). Conclusions The V pattern strabismus patientswith oblique muscle dysfunction are suitable taken the bilateral symmetric inferior oblique weakening surger yand the effect is satisfied when they have bilateral inferior obliques equal overaction. But the cases may still exist the residual vertical strabismus degree and the inferior oblique overaction after surgery. V pattern esotropia is more easily damaged the binocular visual function than that of V pattern exotropia. Key words: V pattern strabismus; Oblique muscle dysfunction; Surgery