Effect of long-term rotation on astigmatism following EVO-toric intraocular collamer lens implantation

Xun Chen; Huamao Miao; Mingrui Cheng; I-Chun Lin; Boliang Li; Yinjie Jiang; Yadi Lei; Xiaoying Wang; Xingtao Zhou

doi:10.3389/fmed.2023.1194006

Effect of long-term rotation on astigmatism following EVO-toric intraocular collamer lens implantation

Front Med (Lausanne). 2023 Jul 14:10:1194006. doi: 10.3389/fmed.2023.1194006. eCollection 2023.

Authors

Xun Chen^{1

2

3

4}, Huamao Miao^{1

2

3

4}, Mingrui Cheng^{1

2

3

4}, I-Chun Lin^{1

2

3

4}, Boliang Li^{1

2

3

4}, Yinjie Jiang^{1

2

3

4}, Yadi Lei^{1

2

3

4}, Xiaoying Wang^{1

2

3

4}, Xingtao Zhou^{1

2

3

4}

Affiliations

¹ Fudan University Eye Ear Nose and Throat Hospital, Shanghai, China.
² National Health Commission Key Lab of Myopia (Fudan University), Shanghai, China.
³ Shanghai Research Center of Ophthalmology and Optometry, Shanghai, China.
⁴ Shanghai Engineering Research Center of Laser and Autostereoscopic 3D for Vision Care (20DZ2255000), Shanghai, China.

Abstract

Objective: To evaluate the effect of long-term rotation on astigmatism following Evolution-toric intraocular collamer lens (EVO-TICL) implantation.

Methods: Forty eyes of 22 patients were enrolled in this prospective study. Visual acuity, refractive parameters, and axial position of the EVO-TICL by OPD-Scan III aberrometer were measured preoperatively, 1 month and 3 years postoperatively.

Results: Last visit, the safety index was 1.32 ± 0.15 and the efficacy index was 1.01 ± 0.23. The best-fitting curve of the attempted versus achieved correction was y = 0.9751x + 0.001. The mean spherical equivalent (SE) decreased from -8.94 ± 2.72D preoperatively to 0.06 ± 0.24D and - 0.36 ± 0.46D 1 month and 3 years postoperatively, respectively. The mean target and surgical induced astigmatism were 1.55 ± 0.61D and 1.67 ± 0.94D 3 years postoperatively. The average expected axis of the TICL was-1.15 ± 9.07 (-21-19°). One month and 3 years postoperatively, the average actual axis was -0.70 ± 9.86 (-20-20°) and - 0.35 ± 11.72 (-25-30°), respectively. The absolute rotation of the TICL was 3.70 ± 4.42 (0-22°) and 6.00 ± 6.70 (0-32°) 1 month and 3 years postoperatively, respectively (p < 0.001). The expected astigmatism was -0.10 ± 0.12D, and the mean actual astigmatism was -0.21 ± 0.30D and - 0.44 ± 0.45D 1 month and 3 years postoperatively, respectively. The mean absolute rotation without postoperative astigmatism was 3.73 ± 2.69 (0-9°) and 1.67 ± 1.66 (0-5°) for low (<2D) and high (≥2D) astigmatic TICL, respectively (p < 0.05).

Conclusion: EVO-TICL implantation is safe and effective, with good predictability and stability. OPD-Scan is a fast device to detect the axial position of the TICL without mydriasis, and the axial position is relatively stable in the long term postoperatively. A slight rotation of low-astigmatic TICL may not cause postoperative astigmatism, whereas rotation of the high-astigmatic TICL may cause it.

Keywords: EVO-toric intraocular collamer lens implantation; OPD-scan; astigmatism; moderate and high myopia; rotation.