LAUSR

Purpose This study aimed to describe the effectiveness and stability of implantable collamer lens (ICL) rotation in reducing high postoperative vault. Setting This study was conducted in the Peking Union Medical College Hospital, Chinese Academy of Medical Sciences. Design This is a retrospective case series. Methods Twenty-two eyes from 22 patients who had ICL (V4c EVO) implantation with high postoperative vault (>=750 μm) were recruited for our study. All the lenses were rotated from a horizontal to an oblique position. The vault, SSA, AOD500, AOD750, TISA500, and TISA750 at 180° and 0° were measured pre-rotation, 1-week post-rotation, and in the at-least 1-year-follow-up. Results Twenty female patients and two male patients were recruited, with a mean age of 28.68 ± 6.08 years. The mean vault had declined significantly from 951.81 ± 154.26 μm pre-rotation to 772.27 ± 119.40 μm 1 week post-rotation (p < 0.001). The SSA, AOD500, AOD750, TISA500, and TISA750 at 180° and 0° pre-rotation and 1-week post-rotation were 30.40 ± 7.91° and 45.14 ± 6.75°, 32.37 ± 7.48° and 46.23 ± 6.39°, 303.27 ± 87.99 and 522.45 ± 122.16 μm, 323.81 ± 89.15 and 536.13 ± 121.66 μm, 387.95 ± 99.43 and 630.81 ± 133.59 μm, 435.68 ± 106.72 and 643.36 ± 132.82 μm, 0.109 ± 0.034 and 0.202 ± 0.053 mm2, 0.123 ± 0.034 and 0.212 ± 0.051 mm2, 0.194 ± 0.056 and 0.345 ± 0.083 mm2, and 0.216 ± 0.055 and 0.358 ± 0.079 mm2 (all p < 0.001). The mean vault value had changed from 747.50 ± 116.07 μm 1-week post-rotation to 586.87 ± 132.65 μm in the 1-year follow-up. However, the SSA, AOD500, AOD750, TISA500, and TISA750 at 180° and 0° had remained stable (p > 0.05). Conclusion Non-toric ICL rotation is a novel and effective technique in the treatment of high postoperative vault. Our results are more robust given the extended period of follow-up.