This test will have a comprehensive analysis to the 18 easy positioning and higher clinical value measurement items elected from the classical analysis methods ( Steiner, Downs, Ricketts, McNamara and Wits etc.). 本实验采取经典的分析法(如Steiner、Downs、Ricketts、McNamara、Wits等)中选择出的容易定点、临床价值较高的18项测量项目进行综合分析。