Influencing factors of near stereopsis of students in pilot recruitment

Objective To analyze the relationship between near stereopsis and refraction or other influencing factors, so as to provide evidence for medical selection of military fl ight cadets. Methods A total of 594 male high school graduates aged 17-19 years participating in the pilot recruitment from June to July in 2017 were cluster randomly enrolled in the study. All participants underwent comprehensive ocular examinations including visual acuity test, cycloplegic refraction and near stereoacuity test. The inf l uencing factors of stereopsis were analyzed using logistic regression and ROC curve analysis. Results Of the 594 participants, 13(2.19%) cases had foveal stereoacuity, the rest were all macular stereoacuity. The differences in spherical refraction (P=0.028) and Spherical Equivalent Refraction (SER) (P=0.033) between students with foveal stereoacuity and students with macular stereoacuity were statistically significant. Logistic regression analysis indicated that binocular SER difference (OR=21.69, 95% CI:4.10-114.75, P=0.000 1) and spherical refraction (OR=3.94, 95% CI:1.06-14.55, P=0.04) were the risk factors for macular stereoacuity. ROC curve analysis suggested that the cut-off value for SER was 0.5 D, with sensitivity of 0.62 and specificity of 0.76. Conclusion Students with anisometropia more than 0.5 D should undergo stereoacuity test.