A Clinical Investigation about Horizontal Heterophoria Among Newly Diagnosed Myopia Juveniles in Nanchong District of China

Abstract

Background: To establish the prevalence and distribution of heterophoria in low myopia juveniles and and provide evidence of myopia prevention and treatment. Methods: Near and distant heterophoria were administered to the patients who were diagnosed of low myopia at their first visit in clinic. Tthe Von Graefe method was performed to test near, distant horizontal heterophoria types and degrees. Statistical analysis was performed with SPSS17.0 software. Results: A total of 150 students were participated in this study. Distant and near phoria was detected in 92.67% and 96.00% of the students respectively. exophoria was more common than esophoria(diantant:79.33% vs 13.33%; near:86.67% vs 9.33%, P<0.05), and the mean deviation of diantant and near heterophoria was -1.97△ and -3.91△. There was a statistical difference between the near and distant heterophoria (P<0.05). Conclusions: Most myopia juveniles have different extents of exophoria. Due to the high prevalence of heterophoria in myopia, in the process of refraction, attention should be paid to the examination of binocular visual function parameters such as heterophoria, which is conducive to the issuance of suitable optical correction prescriptions and the reasonable measures for myopia prevention and control. Keywords: Heterophoria, myopia, juvenile school students