Posters

Correlation between preoperative biometry and Visian ICL vaulting in patients with the same size of inserted lens and corneal diameter

Poster Details

First Author: D.Lee SOUTH KOREA

Co Author(s):    H. Koo   S. Kim                 

Abstract Details

Purpose:

To evaluate the effect of preoperative factors affecting vaulting outcome under the condition that the influence of Visian implantable Collamer lens (ICL) and corneal horizontal white-to-white distance (WTW) were excluded by fixing their size.

Setting:

Private Practice – Nunemiso Eye Center, Seoul, Republic of Korea.

Methods:

Study population of this retrospective observational study was divided into subgroup by implanted ICL size and WTW. With the use of preoperative data as independent variables (including central anterior chamber depth [ACD], anterior chamber volume [ACV], anterior chamber angle [ACA], horizontal angle-to-angle distance between scleral spurs [ATA], crystalline lens rise [CLR], spherical equivalent of cycloplegic refraction errors [CRSE], mean K-reading and axial length [AXL]), stepwise multiple regression analyses were performed to evaluate meaningful factors affecting ICL vaulting. The anterior segment (AS) parameters and ICL vaulting were measured using swept-source anterior segment optical coherence tomography (AS-OCT) and Pentacam.

Results:

A total of 2974 eyes of myopic patients treated with ICL implantation by a single surgeon were included from Jan 2016 to Dec 2018 in a single institution. The largest subgroup (WTW 11.9mm and ICL 12.6 mm) included 198 eyes. ACV, CLR, ACD, ATA and CRSE were selected as significant parameters for the regression model (R2 = 0.38, P < .05). ACV and CLR showed the largest standardized coefficient beta among them (0.404,-0.347). ACV, CLR, ACD and CRSE often showed statistically significant results in several subgroup analyses, including more than one hundred eyes.

Conclusions:

The ICL vaulting based on only the ICL size and horizontal AS diameter could not be quantitatively predicted well. Additional factors, such as three dimensional volumetric size of AS, asphericity of crystalline lens, innate ICL vault, vertical compression force by the iris or dampening effect of the ciliary sulcus soft tissue should be considered to avoid unexpected vaulting after ICL implantation.

Financial Disclosure:

None