Retinal axial focusing and multi-layer imaging with a liquid crystal adaptive optics camera * Liu Rui-Xue(刘瑞雪) a)b) , Zheng Xian-Liang(郑贤良) a)b)c) , Li Da-Yu(李大禹) a) , Xia Ming-Liang(夏明亮) c) , Hu Li-Fa(胡立发) a) , Cao Zhao-Liang(曹召良) a) , Mu Quan-Quan(穆全全) a) , and Xuan Li(宣 丽) a) † a)