·AIM:To investigate diagnostic value of optical coherence tomography(OCT)in asy-mptomatic posterior vitreous detachment(PVD).·METHODS:Ninety-eight eyes of 49 cases which were examined and identified that one eye of each patient had PVD and 186 eyes of 93 cases from normal volunteers were checked with Cirrus HD-OCT made by Zeiss.·RESULTS:Of the 49 cases which had one eye of PVD,24 of the other eyes had different degrees of incomplete PVD,accounting for 48.9%.For the 93 volunteer cases,63 eyes of the 186 eyes were incomplete PVD,occounting of 33.9%,No black shadow symptom occurred for all the patients who had incomplete PVD.·CONCLUSION:OCT has a very good detection specifi-city and sensitivity for PVD,therefore it can be used us the required examination.·