如何选择第一片试戴片
                                          
 1、  角膜散光小于0.50    试戴片 应选平K值+0.05mm
                               
 2、  角膜散光0.75~1.25   试戴片 应选平K值
                                          
 3、  角膜散光1.50~2.00   试戴片 应选平K值-0.05mm
                                       
 4、  角膜散光大于2.00    试戴片 应选平K值-0.1mm