Functional changes included angjospasm of retina,thinning and shortening of macular arteries and venous spiral curves,and all of them disappeared with the decrease in blood vessels.

• 视网膜动脉痉挛,黄斑部动脉变细变短、静脉螺旋状迂曲,均系功能性改变,随血压下降而消失,动静脉交叉征及静脉驼背属器质性改变,是不可逆的。