Clinical Study of A-V Pattern Strabismus in Korea

ABSTRACT

PURPOSE: To assess the prevalence of A-V pattern strabismus and evaluate the clinical characteristics, surgical methods and outcomes. METHODS: Among 825 patients who underwent horizontal strabismus surgery, the records of patients with A-V pattern strabismus were reviewed retrospectively. The prevalence and clinical characteristics of patients with A-V pattern strabismus were assessed and the surgical methods and outcomes of A-V pattern strabismus were evaluated. RESULTS: Among 825 patients with horizontal strabismus surgery, 113 (13.7%) patients had A-V pattern. V exotropia was the most common (65.5%) and A esotropia was the least common (7.1%) pattern. A +1.9 inferior oblique overaction in 92.8% of the V-pattern patients and a +1.5 superior oblique overaction in 70.0% of the A pattern patients was found. Among the 113 patients, 64.6% patients underwent oblique muscle surgery and 35.4% patients underwent vertical transposition of horizontal muscle. Vertical incomitance was significantly reduced after surgery in all types of A-V pattern strabismus (p<0.05) with a surgical success rate of 96.5%. CONCLUSIONS: A 13.7% prevalence of A-V pattern in horizontal strabismus patients was found, with V exotropia being the most common. The vertical incomitance was successfully corrected after surgery.