The long-term observation of the rotation of implantable collamer lens as the management of high postoperative vault.

ABSTRACT

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.