Spatial Variation in Ciliary Body Morphology and the Effect on Haptic Position and Peripheral Vault After ICL Implantation.

Abstract

Purpose: To investigate the association of local ciliary body morphology with the haptic position and peripheral vault.

Methods: This retrospective observational study included 95 eyes of 59 patients treated with the EVO Implantable Collamer Lens (ICL) (STAAR Surgical). Ciliary body morphology parameters (ciliary process length [CPL], ciliary sulcus width [CSW], and scleral spur-ciliary process distance [SCD]), the relative position of ICL haptic to the ciliary process, the haptic-related parameters (the final tip point of ICL haptic [ftICL haptic] and lowest point of ICL haptic), and peripheral vault in the location of each haptic were measured with ultrasound biomicroscopy 3 months after surgery. Factors associated with ftICL haptic and peripheral vault were evaluated.

Results: The haptics were in the ciliary sulcus, on the anterior angle of the ciliary process, within the ciliary process, and under the ciliary process in 45.5%, 25.4%, 21.8%, and 7.4% of cases, respectively. The peripheral vault in the infero-temporal quadrant was significantly greater than that in the other three quadrants (all P < .05). Local SCD, CPL, and CSW were associated with ftICL haptic, whereas local CSW, ftICL haptic, and spherical equivalent were associated with peripheral vault (all P < .05).

Conclusions: Local ciliary body morphology was associated with the haptic position and both factors collectively influence the peripheral vault. To achieve optimal outcomes, local ciliary body morphology should be considered when selecting ICL size and implantation orientation. [J Refract Surg. 2025;41(3):e199-e206.].