Characteristics And Factors Associated With The Position Of The Haptic After Icl V4c Implantation

Using ultrasound biomicroscopy (UBM) image to quantitatively assess the position of ICL haptic image and investigate its characteristics and associated factors.

Hankou Aier Eye Hospital, Wuhan, China.

167 subjects（323 eyes）implanted with ICL V4C who had underwent a 3-month follow-up with UBM examination were recruited. The relative position of ICL and ICL haptic related parameters were estimated on the UBM image. Based on the ftICL haptic, the patients were divided into three subgroups (group1:≤0.5 mm, group 2:0.5-1.0 mm, group3:≥1.0 mm, respectively), the differences of clinical vault among three subgroups were also analyzed. Univariate and multivariate regression analyses were used to assess the associations between ICL haptic related parameters and ocular biometrics.

The ftICL haptic and the summation of ICL arc and lens arc showed a correlation with the clinical vault (r=-0.34 P=0.00; r=0.87 P=0.00). When divided the ftICL haptic into three subgroups, the percentage of eyes which exhibited clinical vault >750μm were lowest in the group 3. Multivariate regression analysis showed spherical equivalent (SE), white to white (WTW), anterior chamber volume (ACV) and iris-ciliary angle (ICA), the difference between the implanted ICL size and horizontal sulcus-to sulcus (ICL size-STS) were associated with the ftICL haptic. The IOP, WTW, ACV, and the ICL size-STS were significantly associated with ICL arc while the ICA and Lens rise were associated with lens arc.

Comprehensive UBM assessment after ICL surgery can provide valuable information to understand the clinical vault of eyes implanted with ICL V4C.