The Association between Different Ocular Dominance and Fixation Preferences in Adolescents with Intermittent Exotropia
Yao Tang1, 2, Xiaoning Li2 , Bin Zhang3 , Qinglin Xu1, 2, Haoran Wu1, 2, Zhikuan Yang
1 Aier School of Ophthalmology, Central South University, Changsha 410000, China 2 Aier Institute of Optometry and Vision Science, Changsha 410000, China 3 College of Optometry, Nova Southeastern University, Florida 33314, United States
To investigate the association between different ocular dominance and fixation preferences in adolescents with intermittent exotropia (IXT). Methods: In this case serial study, a total of 43 patients with IXT from Aier Institute of Optometry and Vision Science from July to December 2018 participated. With full refractive error correction, the hole-in-the-card test was used to identify sighting dominance, the near point of convergence test was used to determine motor dominance, and a continuous flash technique based on a Gabor patch was used to determine ocular sensory dominance. The preferred eye for fifixation was determined by Mayo's office control scale when observing a target at long distance. The degree of agreement between the dominant eye and the preferred eye for fifixation was quantifified with Kappa statistics. And the association between the above-mentioned concordance and ocular dominance index (ODI) was analyzed by logistic regression. Results: For a total of 43 patients with IXT, sighting dominance, motor dominance, and sensory dominance showed moderate agreement with fixation preference (the Kappa values were 0.46, 0.43, and 0.68, respectively, P<0.001). When there was a clear sensory dominance, the agreement between the sensory dominant eye and the preferred fifixation eye was fairly high (Kappa values was 0.86, P<0.001), while the agreements of the other two kinds of ocular dominance and fixation preference were still moderate (the Kappa values were 0.57 and 0.44, respectively, P<0.01). Logistic regression showed that the probability for the preferred fifixation eye to agree with the sensory dominant eye increased with the value of ODI (B=0.53, OR=1.70, P<0.001), the greater the ODI value, the higher the probability for agreement between the sensory dominant eye and the preferred fifixation eye. Conclusion: For IXT adolescents, there is a consistent relationship between ocular dominance and fixation preference. The results of sensory ocular dominance are more closely related to the preferred eye for fifixation, especially when there is a clear sensory dominance, which is more reliable than a sighting dominance test or motor dominance test.
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Yao Tang1, 2, Xiaoning Li2,Bin Zhang3,Qinglin Xu1, 2, Haoran Wu1, 2, Zhikuan Yang. The Association between Different Ocular Dominance and Fixation Preferences in Adolescents with Intermittent Exotropia. Chinese Journal of Optometry Ophthalmology and Visual science, 2019, 21(10): 740-745. DOI: 10.3760/cma.j.issn.1674-845X.2019.10.004
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