1. Making stereopsis related to the ability of ocular deviation: a new paradigm for assessment of intermittent exotropia
- Author
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Jian-Bing Li, Wan-Ting Kong, Tao Shen, Yong-Guang Yuan, Chong-Lin Chen, Dan-Min Peng, Min-Tong Liang, Xuan He, Dan Luo, Jia-Yi Su, Wei Wang, Rui-Xin Wang, and Xin-Ping Yu
- Subjects
intermittent exotropia ,stereopsis ,control ability ,Ophthalmology ,RE1-994 - Abstract
AIM: To investigate the underlying factors by establishing a new paradigm for assessing control ability under stereopsis testing conditions. METHODS: This was a prospective observational study. We evaluated the control ability of intermittent exotropia (IXT) patients in three conditions: natural 2D optotype viewing, 2D optotype viewing with polarized glasses, and 3D optotype viewing with polarized glasses. Recording with a smartphone, we captured videos to analyze the accurate time of spontaneous exodeviation and subsequent realignment before and after breaking fusion. Additionally, the correlation of stereopsis were also analyzed. RESULTS: A total of 48 patients (age range: 4-33y; 54.17% male) participated in the study. When viewing 3D optotypes with polarized glasses, their median control scores were 1 (interquartile range, 0-4) at distance and 0 (0-1) at near. These scores were significantly better than those observed under natural viewing conditions, which were 2.5 (1-5) at a distance and 1 (0-3) at near (Friedman test, P=0.049). Furthermore, those subjects who exhibited exophoria (realignment within 2 seconds) while viewing 3D optotypes with polarized glasses were more likely to have measurable stereo vision (Kendall's τb=-0.344, P=0.018). CONCLUSION: IXT patients exhibit enhanced control ability when using polarized glasses to view 3D optotypes, notably improving realignment capabilities. This expands our understanding of current tests and offers a potentially sensitive method for assessing IXT severity.
- Published
- 2025
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