Fusional Vergence Detected by Prism Bar and Synoptophore in Chinese Childhood Intermittent Exotropia

Figure 1

Comparison of the fusional vergence detected using a prism bar in patients with IXT and normal subjects. The mean convergence amplitude was significantly lower for children with IXT compared with normal children at both distance and near (distance: 18.65 ± 1.50 versus 26.46 ± 1.53 pd, ; near: 18.20 ± 1.59 versus 31.08 ± 1.40 pd, ). The mean divergence amplitudes were significantly greater for children with IXT than for normal children (distance: 18.75 ± 0.99 versus 8.81 ± 0.32 pd, ; near: 24.69 ± 1.33 versus 15.91 ± 0.46 pd, ). The mean distance between the recovery and break points for both convergence and divergence was significantly larger at both distance and near for IXT children compared with normal subjects (for convergence, distance: 7.67 ± 1.06 versus 5.21 ± 0.51 pd, ; near: 8.13 ± 1.19 versus 5.30 ± 0.44 pd, ; for divergence, distance: 4.76 ± 0.72 versus 2.18 ± 0.08 pd, ; near: 6.33 ± 0.79 versus 2.26 ± 0.10 pd, ).