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CLINICAL TRIAL
JOURNAL ARTICLE
RANDOMIZED CONTROLLED TRIAL
RESEARCH SUPPORT, NON-U.S. GOV'T
Selective surgery for intermittent exotropia based on distance/near differences.
Archives of Ophthalmology 1998 March
BACKGROUND: Classic teaching suggests that surgery for intermittent exotropia should be based on distance/near differences. Divergence excess, according to tradition, should be treated with symmetric lateral rectus recessions; simulated divergence excess and basic deviations should be treated with a recess/resect procedure. This teaching, to our knowledge, has not been systematically tested.
OBJECTIVES: To evaluate the appropriateness of selective surgery based on distance/near differences and to determine if bilateral lateral rectus recessions affect the distance deviation more than the near deviation.
PATIENTS AND METHODS: Patients with basic type intermittent exotropia were randomized to 2 groups, those receiving either unilateral recess/resect procedures or symmetric lateral rectus recessions. Patients with simulated divergence excess intermittent exotropia received symmetric lateral rectus recessions. Outcome was observed 1 year after surgery.
RESULTS: Of 19 patients with basic exotropia receiving lateral rectus recessions, 10 patients (52%) had a satisfactory outcome compared with 14 (82%) of the 17 patients who had recess/resect procedures (P<.05). Of the 68 patients with simulated divergence excess, 55 patients (80%) had a satisfactory outcome after bilateral/lateral rectus recessions. This result was significantly better than the outcome for patients with basic exotropia who underwent lateral rectus recessions (P<.05) [corrected]. The decrease in the distance/near difference after surgery was essentially identical for patients with basic exotropia who underwent lateral rectus recessions as for those who received recess/resect procedures (means, 2.4 prism diopters vs 2.1 prism diopters, respectively).
CONCLUSIONS: Although this study did not evaluate increasing the amount of symmetric lateral rectus recessions for patients with basic exotropia, these data suggest that patients with basic type intermittent exotropia should be treated with recess/resect procedures. Data also suggest that patients with simulated divergence excess do well with lateral rectus recessions. Recess/resect procedures and symmetric surgery affect distance/near differences equally in patients with basic exotropia.
OBJECTIVES: To evaluate the appropriateness of selective surgery based on distance/near differences and to determine if bilateral lateral rectus recessions affect the distance deviation more than the near deviation.
PATIENTS AND METHODS: Patients with basic type intermittent exotropia were randomized to 2 groups, those receiving either unilateral recess/resect procedures or symmetric lateral rectus recessions. Patients with simulated divergence excess intermittent exotropia received symmetric lateral rectus recessions. Outcome was observed 1 year after surgery.
RESULTS: Of 19 patients with basic exotropia receiving lateral rectus recessions, 10 patients (52%) had a satisfactory outcome compared with 14 (82%) of the 17 patients who had recess/resect procedures (P<.05). Of the 68 patients with simulated divergence excess, 55 patients (80%) had a satisfactory outcome after bilateral/lateral rectus recessions. This result was significantly better than the outcome for patients with basic exotropia who underwent lateral rectus recessions (P<.05) [corrected]. The decrease in the distance/near difference after surgery was essentially identical for patients with basic exotropia who underwent lateral rectus recessions as for those who received recess/resect procedures (means, 2.4 prism diopters vs 2.1 prism diopters, respectively).
CONCLUSIONS: Although this study did not evaluate increasing the amount of symmetric lateral rectus recessions for patients with basic exotropia, these data suggest that patients with basic type intermittent exotropia should be treated with recess/resect procedures. Data also suggest that patients with simulated divergence excess do well with lateral rectus recessions. Recess/resect procedures and symmetric surgery affect distance/near differences equally in patients with basic exotropia.
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