Intraocular lens power calculation for silicone oil-dependent eyes

Leyi Wang; Xin Wang; Xuepeng Yang; Yuanyuan Si; Jiayin Wu; Yan Cui

doi:10.3389/fmed.2023.1271897

Intraocular lens power calculation for silicone oil-dependent eyes

Front Med (Lausanne). 2023 Oct 23:10:1271897. doi: 10.3389/fmed.2023.1271897. eCollection 2023.

Authors

Leyi Wang¹, Xin Wang^{1

2}, Xuepeng Yang¹, Yuanyuan Si¹, Jiayin Wu¹, Yan Cui¹

Affiliations

¹ Department of Ophthalmology, Qilu Hospital of Shandong University, Jinan, Shandong, China.
² Affiliated Eye Hospital of Shandong University of TCM, Jinan, Shandong, China.

Abstract

Background: Silicone oil tamponade is widely used in vitreoretinal surgery. In some cases, silicone oil may not be extracted for a long time or even permanently and is referred to as silicone oil-dependent eyes. In this study, we aimed to deduce a theoretical formula for calculating intraocular lens power for silicone oil-dependent eyes and compare it with clinical findings.

Methods: A theoretical formula was deduced using strict geometric optical principles and the Gullstrand simplified eye model. The preoperative and postoperative refractive statuses of patients with silicone oil-dependent eyes who underwent intraocular lens implantation were studied (Group A, n = 13). To further test our derived theoretical formula, patients with silicone oil tamponade and first-stage intraocular lens implantation were included (Group B, n = 19). In total, 32 patients (32 eyes) were included in the study.

Results: In group A, the calculated intraocular lens power based on our formula was 24.96 ± 3.29 diopters (D), and the actual refraction of the patients was 24.02 ± 4.14D. In group B, the theoretical intraocular lens power was 23.10 ± 3.08D, and the clinical intraocular lens power was 22.84 ± 3.42D. There was no significant difference between the theoretical and clinical refractive powers, and the intraclass correlation coefficient was 0.771 for group A and 0.811 for group B (both p ≤ 0.001). The mean absolute error for silicone oil-dependent eyes of the formula was 1.66 ± 2.09D. After excluding data for two patients with a flat cornea (corneal refractive power < 42D), the mean absolute error decreased to 0.83 ± 0.62D.

Conclusion: A strong correlation between the theoretical and clinical intraocular lens powers was observed, and the formula we deduced can be used to calculate the intraocular lens power for silicone oil-dependent eyes. This formula will help clinicians select a more appropriate intraocular lens for patients with silicone oil-dependent eyes, especially when the corneal refractive power is ≥42D.

Keywords: intraocular fillers; intraocular lens power; silicone oil; theoretical formula; vitreoretinal surgery.

Grants and funding

The author(s) declare financial support was received for the research, authorship, and/or publication of this article. This study was supported by the Natural Science Foundation of Shandong Province [grant number ZR2020MH174], the Medical and Health Development Program of Shandong Province [grant number 2017WS207], and the Qilu Hygiene and Health Leading Personnel Project.