Pressure phosphene tonometer ( ppt ) is a new device using phosphene - a visual sensation resulting from pressure applied through the eyelid to the eyeball and then to the retina - to measure iop 闪光眼压计（ pressurephosphenetonometer ）是一种崭新的量度眼压方法-透过对眼睑施压，压力经过眼球传到视网膜，产生光幻闪光的现象，可用以量度眼压。
