Predictability of the vault after posterior chamber phakic intraocular lens implantation using anterior segment optical coherence tomography

Abstract

To determine whether vault measurements after placement of a hole implantable collamer lens (hole ICL) (KS-AquaPORT) can be predicted by angle-to-angle (ATA) and white-to-white (WTW) measurements obtained with anterior segment optical coherence tomography (AS-OCT). Sanno Hospital, Tokyo, Japan. Retrospective case series. Eyes were observed for 3months after hole ICL implantation for myopia or myopic astigmatism. Central vault, ATA, and WTW measurements were obtained before and after surgery using the swept-source AS-OCT CASIA2 system. The study included 44 eyes (23 patients). The mean patient age and preoperative spherical equivalent, ATA, and WTW values were 36.2years±8.8 (SD), -6.23±3.41 diopters (D), 12.03±0.40mm, and 11.72±0.40mm, respectively. The safety index and efficacy index 3months postoperatively were 1.13±0.21 and 0.91±0.30, respectively. Regarding predictability, 93.2% of eyes were within ±0.50 D of the attempted correctionand all eyes were within ±1.00 D. The reproducibility coefficients for the ATA distance and WTW distance were 0.998and 0.960, respectively. The mean postoperative central vault was 491.6±189.5μm. There was a significant correlation between postoperative vault and the ICL size and ATA distance (Spearman rank correlation coefficient r=0.59, P<.001) butnot between the ICL size and WTW distance (r=0.27, P=.08). The ATA measurements had higher reproducibility than the WTW measurements on AS-OCT, making it is a more important predictor of postoperative vault.