Purpose of the research: is to study the effect of anterior chamber maintainer on the incidence of posterior vitreous detachment after phacoemulsification. Results: In the current study , our work is to inspect incidence of occurrence of PVD after one M and 3 Ms after uneventful phacoemulsification with and without ACM , In patients with complete vitreal attachment preoperatively . The current study ,revealed that the development of postoperative PVD after phacoemulsification at 1 month in 9.7% in group A and 15.2% in group B, While at 3 months PVD developed in 12.9% (8 eyes of 62 eyes) in group A, and 27.2% (25 eyes of 92 eyes) in group B. the incidence of PVD among group A between non- high myopic & high myopic patients , there were no significant difference at 1 month 5.6% and 15.4% and at 3 months were 8.3% and 19.2% in non-high myopic and high myopic patients respectively But in group B the incidence of PVD at 1 M and 3 Ms was significantly higher among high myopic patients than non-high myopia , at one month was 6.2% , 37.0% and at three months 13.8% , 59.3% in non-high myopia and high myopic patients respectively. Conclusions: The current study suggest that improving anterior chamber stability by using ACM especially in high myope patients and younger age minimize incidence of PVD after phacoemulsification surgery.