Abstract
Purpose
To investigate the spherical shift of intraocular lens (IOL) tilt after intrascleral fixation.
Methods
We retrospectively reviewed the medical records of patients who underwent flanged intrascleral IOL fixation with transconjunctival 25- or 27-gauge pars plana vitrectomy at the Department of Ophthalmology of the Jikei University Hospital. The minimum follow-up duration was 3 months. Second-generation anterior segment optical coherence tomography (CASIA2; TOMEY) was used to obtain the values of tilt and decentration of the intrasclerally fixated IOL and postoperative anterior chamber depth. We investigated the relationship between refractive error and various parameters, such as IOL tilt and decentration, axial length, and keratometry. In addition to our clinical investigation, we conducted optical simulations using Zemax to evaluate the spherical shift of the IOL tilt by means of the through-focus response and change in spherical equivalent power.
Results
The study involved 72 eyes of 67 patients. The degree of IOL tilt was correlated with the amount of refractive error (Spearman’s rank correlation coefficient [CC] = − 0.32; P = 0.006). In particular, a tilt angle greater than 10° strongly affected the refractive error. The postoperative anterior chamber depth also correlated with the refractive error (CC = 0.50; P < 0.001), as opposed to decentration (CC = − 0.17; P = 0.15), axial length (CC = − 0.08; P = 0.49), and keratometry (CC = − 0.06; P = 0.64). Optical simulations also revealed a myopic shift that exponentially increased as the tilt became greater.
Conclusion
IOL tilts that are greater than 10° induce refractive error.
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Data availability
Clinical data supporting the findings of this study are available within the article and its Supplementary Information.
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The authors thank Tjundewo Lawu for conducting optical simulation using ZEMAX.
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Financial interests: Author T. Nakano has received Grant from CREWT Medical Systems, Kyowa Medical, Kuribara Medical Instruments, Kowa, Tomey, Otsuka Pharmaceutical, Senju Pharmaceutical, MSD, Pfizer, Alcon Japan, Santen Pharmaceutical, NIDEK, AMO Japan Bayer, and IOL MEDICAL. Author T. Nakano has also received Personal Fees from Kowa, Otsuka Pharmaceutical, Senju Pharmaceutical, Santen Pharmaceutical, Nitto Medical, and Nikon.
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This study was conducted with approval from the institutional review board and in accordance with the ethical standards of the Helsinki Declaration of 1975, as revised in 2000 and 2008.The study protocol was approved by the Institutional Review Board of the Jikei University School of Medicine (approval no.:31–421[10003]), and all clinical procedures were conducted according to the principles of the Declaration of Helsinki.
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Tokuhisa, T., Watanabe, T., Watanabe, A. et al. Refractive error induced by intraocular lens tilt after intrascleral intraocular lens fixation. Int Ophthalmol 42, 1213–1220 (2022). https://doi.org/10.1007/s10792-021-02106-3
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DOI: https://doi.org/10.1007/s10792-021-02106-3