眼压的波动（昼夜 季节）
正常人眼压有周期性波动（5mmHg）
 Normal eye has periodicity fluctuation
青光眼患者的眼压波动大于正常对照组 
 Glaucoma eye > Normal eye                                                           
一旦眼压升高就可能 造成损伤
 It will be damaged while IOP increased
.....

眼压检测方法:
非接触性眼压计（NCT）
间隔2小时一次，每眼测量三次取均值
 Mean IOP of three times per 2 hours
时间点 Time points as: 9:00, 11:00, 13:00, 15:00, 17:00, 19:00, 21:00, 23:00, 1:00, 3:00, ....