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To assess long-term clinical outcomes of Visian implantable collamer lens(ICL) V4c implantation based on internal measurement using swept-source Fourier-domain anterior segment optical coherence tomography(AS-OCT).
Patients who underwent V4c ICL implantation from June, 2018 to December, 2018 and completed 6 month follow-up in Nunemiso Eye Clinic have been collected. Six-month clinical outcomes of 388 eyes of 195 subjects were analyzed. ICL size for implantation was determined by internal measurement using swept-source AS-OCT(CASIA2). Anterior chamber values with other modalities including Pentacam HR, Gallilei G4 and IOL master 500 were also measured pre-operatively and compared with that of CASIA2.
Mean pre-operative myopia, astigmatism and axial length for the study group was -7.2±2.7D, -1.6±1.0D and 26.58±1.17mm, respectively. Mean post-operative ICL vaulting at 6-month post-op. was 519.0±159.9um. Considering the stable vaulting range from 250um to 750um, percentage of the low vault was 4.4%(17 eyes) and high vault was 5.7%(22 eyes). ICL exchange was done in 2 cases(0.51%) due to excessively low(<150um) or high(>1000um) vault. Angle-to-angle measurement by CASIA2 was not significantly different with white-to-white(WTW) measurement by Pentacam HR. However, it showed significant differences with WTW values by Gallilei G4 or IOL master 500(p<0.05).
High accuracy for the stable lens vaulting would be expected with swept-source AS-OCT based ICL implantation. Also, pre-op. analysis of anterior chamber values by CASIA2 could reduce complications and re-operation rates. Thus, high-resolution, fast scanning nature of CASIA2 offers predictable and safe results for the ICL surgery with convenience.