Characteristics of the Haptic Position and Its Impact on Vault After Horizontal or Vertical ICL Implantation.

PURPOSE: To evaluate the haptic positioning and its impact on postoperative vault after horizontal versus vertical Implantable Collamer Lens (ICL) implantation.

METHODS

Eighty eyes (80 patients) undergoing ICL V4c (STAAR Surgical) implantation were stratified into horizontal (n = 40) and vertical (n = 40) groups. Ultrasound biomicroscopy measured ciliary sulcus-to-sulcus, crystalline lens to ciliary sulcus-to-sulcus, central vault (C-Vault), peripheral vault, and categorized haptic positions relative to ciliary anatomy (supratemporal, inferotemporal, supranasal, inferonasal). Statistical analyses compared intergroup differences and associations between parameters.

RESULTS

Haptic distribution in the horizontal group varied by quadrant: 42.6% of haptics were in the ciliary sulcus (vs 40.8% vertical, P = .601), 29.4% of haptics were under the ciliary process (vs 23.7% vertical, P = .797), 21.8% of haptics were on the anterior angle of the ciliary process (vs 24.9% vertical, P = .302), and 6.1% of haptics were inserted into the ciliary process (vs 10.6% vertical, P = .023). The final tip of the ICL haptic negatively correlated with C-Vault in the horizontal (P = .009) and vertical (P = .049) groups, but showed no significant correlation with peripheral vault.

CONCLUSIONS

No statistically significant differences in haptic distribution patterns were observed between the horizontal and vertical implantation groups, whereas haptic position demonstrated significant correlations with central vault.