AIM: To investigate the strabismus situation in Department of Ophthalmology during physical examination of cadet candidates, and to explore the factors that influence the properties of the short-term changes of strabismus.

METHODS:The exophoria and exotropia of 4 231 qualified students in China Southern Airlines were compared and analyzed with normal students vision and refractive degree distribution during 2008-2012.

RESULTS:The exophoria value, difference of binocular visual acuity and anisometropia was large, and visual fatigue easily lead to exophoria or external oblique.

CONCLUSION:During physical examination for students with the binocular visual acuity differences >0.4, exophoria anisometropia >2.00D and visual fatigue symptoms, we should check the three levels of visual function.