Effect Of Anterior Segment Structure On Vault And Position After Implantable Collamer Lens Implantation

To evaluate the effect of anterior segment structure on vault and position after implantable collamer lens (ICL) implantation.

This study included 53 patients (71 eyes) with myopia who underwent Visian ICL V4c implantation at the Chongqing Eye and Vision Care Hospital · Aier Eye Hospital Group.

The retrospective case-control study included insufficient vault eyes (<250 µm), ideal vault eyes (250 µm-750 µm), and excessive vault eyes (>750 µm). The preoperative biometric parameters of the anterior segment and basic data between the three groups were analyzed using one-way analysis of variance.

There were significant differences(p<0.05) between the three groups in maximum ciliary body thickness (CBT_max),, and trabecular-ciliary angle (TCA). The vault gradually decreased as CBT_max decreased and TCA increased. In the pairwise comparison, the CBT_max comparison between the vault <250 µm group and the vault >750 µm group was statistically significant (P < 0.05); the TCA comparison between the vault <250 µm group and the vault >750 µm group was statistically significant (P < 0.05).The analysis of 284 ICL haptics locations shows that there are 16.67%, 32.69% and 70.83% haptics located in the ciliary sulcus in three groups, respectively.

ICL vault is related to anterior segment structure. A smaller ciliary body and larger TCA would increase the risk of low vault and fewer ICL haptics located in the ciliary sulcus after ICL implantation. This provides guidance for the selection of the ICL size and placement position before surgery.