AIM: To investigate changes of anterior chamber parameters after posterior chamber phakic implantable collamer lens(ICL)surgery and its correlation with intraocular pressure(IOP).

METHODS: This was a retrospective case series study. Seventy four eyes in 43 myopia patients were examined by Allegro Oculyzer anterior segment tomography to obtain the changes of anterior chamber volume(ACV), anterior chamber angle(ACA), central anterior chamber depth(ACD)and vault, meanwhile, to measure the IOP to analyze the correlation with anterior chamber parameters.

RESULTS: Compared with preoperative, ACV, ACA, ACD all decreased apparently(P<0.01)in the postoperative period of 1, 3, and 6mo. ACV, ACA and ACD showed their stability in each period after the surgery. There were changes of vault in 1 and 6mo(t=27.66, P=0.01). IOP had not altered when compared with the preoperative. This research revealed that IOP had no relation with ACV, ACA, ACD and vault in every phase(all P>0.05).

CONCLUSION: For patients underwent ICL, the anterior chamber parameters all decreased which included ACV, ACA, ACD, and had stabilized since early postoperative period. Correspondingly,IOP was stable and had not correlate with ACV, ACA, ACD and vault, however the long-term observation is still necessary.