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Effect of the kappa angle on depth of focus after implantation of the TECNIS Symfony intraocular lens

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Abstract

Purpose

To evaluate the clinical effect of TECNIS Symfony intraocular lens (IOL) implantation and identify the effect of kappa angle on the depth of focus (DOF) after implantation.

Methods

This prospective clinical study included consecutive patients who underwent cataract surgery and TECNIS Symfony IOL implantation at the Daqing Oilfield General Hospital from January 2019 to September 2019. Patients were divided into three groups according to the preoperative kappa angle (r): A (0 < r ≤ 0.2), B (0.2 < r ≤ 0.4), and C (r > 0.4). Uncorrected visual acuity was performed preoperatively and at 7 days, 1 month, and 3 months postoperatively. Synthetical optometry, higher-order aberrations, and defocus examinations were performed at 3 months postoperatively. Single-factor analysis of variance and Spearman correlation coefficient were used for data analysis.

Results

The uncorrected visual acuity values of the three groups were significantly improved postoperatively, compared with preoperative values (p < 0.001). Three months postoperatively, the best-corrected visual acuity values of the three groups were 0.11 ± 0.02 logarithm of the minimum angle of resolution (logMAR), 0.09 ± 0.03 logMAR, and 0.11 ± 0.03 logMAR, respectively. Spherical equivalent (SE) values were 0.37 ± 0.08 D, 0.41 ± 0.06 D, and 0.42 ± 0.06 D, respectively. Best-corrected visual acuity and SE did not significantly differ among the three groups (F = 1.254, p = 0.135; F = 0.849, p = 0.228). There was no significant difference in SE between the three groups (F = 1.658, p = 0.312). Moreover, higher-order aberrations did not significantly differ among the three groups (p > 0.05). The kappa angle was negatively correlated with the postoperative DOF (r = −4.341, p = 0.026). Three months postoperatively, 54.55% of patients exhibited DOF ≥ 3 D, while 92.42% of patients exhibited DOF ≥ 2 D. The ranges of DOF in the three groups were 3.18 ± 0.27 D, 2.83 ± 0.80 D, and 2.57 ± 0.89 D, respectively; the difference among the three groups was statistically significant (F = 5.689, p = 0.037).

Conclusion

Most patients achieved full-range vision after TECNIS Symfony IOL implantation, but the DOF narrowed for those with an excessively large kappa angle, which indicates a need for careful selection.

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Data availability

The data used to support the findings of this study are available from the corresponding author upon request.

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Acknowledgements

Feng Wang and Ying Su contributed equally to this work and worked as co-correspondence author.

Funding

Scientific research project of Heilongjiang Health and Family Planning Commission (2019-367).

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Author notes

  1. Feng Wang and Ying Su have contributed equally to this work.

Authors and Affiliations

  1. Department of Ophthalmology, The First Affiliated Hospital of Harbin Medical University, 23 Bundesgasse, Harbin, Heilongjiang Province, China

    Jie Luo, Feng Wang, Ying Su, Haitao Du & Qiang Guo

  2. Department of Ophthalmology, The Daqing Oilfields General Hospital, 19 ZhongKang Roud, Daqing, Heilongjiang Province, China

    Jie Luo, Yang Liu & Xuebing Xiao

Authors
  1. Jie Luo
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  2. Yang Liu
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  3. Feng Wang
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  6. Haitao Du
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  7. Qiang Guo
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Contributions

Yang Liu performed the operation of the participants. Ying Su, Xuebing Xiao Haitao Du, and Qiang Guo performed ophthalmological evaluation of the participants. Jie Luo and Feng Wang analyzed and interpreted the data, and they are major contributor in writing the manuscript. All authors read and approved the final manuscript.

Corresponding authors

Correspondence to Feng Wang or Ying Su.

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Competing interests

The authors report no conflicts of interest in this manuscript.

Animal research (ethics)

Animal experiments are not covered in this paper.

Consent to participate (ethics)

This study adhered to the tenets of the Declaration of Helsinki. This study was approved by Institutional Review Board and Ethics Committee of the Daqing oilfield general hospital (Project No: ZYAF/SC-07/02.0).

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Consent to publish has been obtained from the participant.

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Plant experiments are not involved in this paper.

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This study is technically mature and does not involve clinical trials.

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Luo, J., Liu, Y., Wang, F. et al. Effect of the kappa angle on depth of focus after implantation of the TECNIS Symfony intraocular lens. Int Ophthalmol 41, 2513–2520 (2021). https://doi.org/10.1007/s10792-021-01809-x

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