The first question: In your lecture, A/V ratio is believed to be the early signal in the hypertensive retinopathy, I wonder if this sign really precedes the increase of the blood pressure?

• 第一个问题：您在报告中提到，视网膜动静脉比被认为是高血压视网膜病变的早期表现，那么，它是不是真的可以预示血压的升高呢？