Headache HP OH OA Ref Ani BMI Sleep Headache 1.00               Head position(HP) .18** 1.00             Ocular height(OH) .14** .60** 1.00           Ocular alignment(OA) .09** .16** .22** 1.00         Refraction (Ref) .08** .026 .03 .22** 1.00       Anisometropia (Ani) -.01 .00 -.01 -.02 -.01 1.00     BMI .01 -.05* .03 .06** .09** .05* 1.00   Sleep .03 -.03 .01 .05* .05* .00 .10** 1.00 **p value≤0.01;  * p value≤ 0.05

Table 3: The correlation of between headache and head position(HP), ocular height(OH), ocular alignment (OA), refractory status (Ref), Anisotropia (Ani), body mass index (BMI), sleep were demonstrated.