Clinical results of Visian implantable collamer lens implantation according to various sizes and implantation angles

Purpose: To investigate the clinical outcomes of Visian implantable collamer lens (ICL) implantation according to lens size and implantation angle. Setting: Onnuri Smile Eye Clinic, Seoul, Republic of Korea. Design: Retrospective case series. Methods: This study included 566 eyes of 283 patients treated with ICL implantation. Patients were divided into three groups: horizontally implanted same-sized ICL (group A), horizontally implanted different sized-ICL (group B: large ICL and small ICL) and same sized-ICL implanted with a different implantation angle (group C: horizontal and vertical). Results: At 12-month follow-up, the mean vault was 0.78 ± 17, 0.48 ± 0.13, 0.71 ± 0.18 and 0.44 ± 0.16 mm when large and small sized ICL was used in group B ( p < 0.001), and when ICL was horizontally and vertically implanted in group C ( p = 0.021), respectively. And the mean SE was −0.11 ± 0.30, −0.34 ± 0.42, −0.3 ± 0.56 and −0.64 ± 0.66 dioptres (D), when the large and the small sized ICL was used group B ( p = 0.039), and when the ICL was horizontally and vertically implanted in group C ( p = 0.036), respectively. No significant difference in UDVA, IOP and ECD between both eyes in groups B and C was observed. No statistical difference was found in the vault between both eyes for groups B and C. Conclusions: The vault was significantly higher and the SE was significantly more hyperopic when a larger-sized ICL was used or the ICL was horizontally implanted compared to when the ICL was vertically implanted.