Perception of 3-dimensional dynamic images after successful surgery for exotropia

Abstract

Purpose: To evaluate the perception of 3-dimensional (3-D) dynamic imaging in patients with intermittent exotropia (IXT) after surgery.Methods: Fifty-one subjects, including 26 patients who planned surgery for IXT and 25 age-matched controls, were enrolled. The 3-D dynamic images were divided in 10 units from 0 (0-mm image disparity, 2-D image) to 100 (15-mm image disparity).Results: In the control group, the mean 3-D motion perception was 48.43±18.45 arcsec, and the mean stereoacuity in the Titmus stereotest was 60.38±37.25 arcsec. There was positive correlation between the mean 3-D motion perception (Log arcsec) and Titmus stereoacuity (Log arcsec) (Correlation=0.421, p=0.026). In the IXT group, the mean preoperative distance deviation was prism diopters (PD) at distance and 26.04±8.09 PD at near range; these measurements improved to 1.36±3.56 PD at distance and 0.28 ±0.68 PD at near range after surgery. The mean 3-D motion perception was 61.26±25.97 arcsec preoperatively, which improved to 49.01±20.44 arcsec three months after surgery (p=0.024). The mean stereoacuity in the Titmus stereotest was 90.40±77.75 arcsec preoperatively, which improved to 63.20±29.40 arcsec three months after surgery (p=0.030). The mean 3-D motion perception and mean stereoacuity in the Titmus stereotest showed statistically significant positive correlations preoperatively (Correlation=0.709, p<0.001) and postoperatively (Correlation=0.466, p=0.038).Conclusions: 3-D motion perception and Titmus stereoacuity improved after successful IXT surgery. Thus, 3-D dynamic stereotesting may be a useful measurement for successful IXT surgery due to correlations with real-life 3-D images.