Abstract: Objective To observe the effects on the stereopsis after posterior chamber phackic implantable collamer lens (pICL) implantation. Design Retrospective case series. Participants 77 eyes of 40 myopia patients were involved, who were performed pICL implantation in Affiliated Hospital of Guizhou Medical University from October 2014 to October 2015. Methods Preoperative best corrected visual acuity （BCVA） and stereopsis were compared with uncorrected visual acuity (UCVA) and stereopsis postoperative 1 month and 3 month respectively. Main Outcome Measures UCVA、BCVA and stereopsis. Results UCVA and BCVA preoperatively was （0.06±0.06） and （0.85±0.22） respectively. Postoperative 1 month and 3 month, mean UCVA was（0.92±0.24）and（0.97±0.25） respectively. The UCVA of postoperative 1 month and 3 month were obviously improved comparison with the BCVA of preoperative (all P=0.000). The preoperative near stereopsis was no statistically significant difference from that at postoperative 1 month(P=0.259). The near tereopsis at the postoperative 3 month more significant improve than preoperatively (P=0.016). In the group of the anisometropia less than 2.50 D, the near stereopsis at the postoperative 3 month more significant improve than preoperatively (P=0.046). In the group of the anisometropia greater than or equal to 2.50 D,  there was no statistically significant difference when comparison of the near stereopsis vision between the two groups （P=0.343，0.158，0.774， respectively）. The far stereopsis at the postoperative 1 month and postoperative 3 month were more significant improve than preoperatively (P=0.010, 0.000, respectively). In the group of the anisometropia less than 2.50 D, the far stereopsis at the postoperative 3 month were more siginificant improve than preoperatively(P=0.001). In the group of the anisometropia greater than or equal to 2.50 D , the far stereopsis at the postoperative 3 month more siginificant improve than preoperatively (P=0.009). Conclusion The pICL implantation can significantly reduce anisometropia and improve the vision acuity, the near and distance stereopsis.

Key words: posterior chamber phackic implantable collamer lens, visual acuity, stereopsis