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Changes in effective optical zone after small-incision lenticule extraction in high myopia

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Abstract

Purpose

To evaluate the four measurement approaches on the determination of effective optical zone (EOZ) using Scheimpflug tomography after small-incision lenticule extraction surgery in eyes with high myopia.

Setting

Corneal refractive surgery conducted in an eye hospital in southern China.

Design

This is a retrospective cohort study.

Methods

In total, 74 subjects were recruited. EOZ was measured at 3 months postoperatively using vertex-based (EOZV), pupil-based (EOZP), 4 mm-ring-based total corneal refraction method (EOZ4) and tangential curvature difference map method (EOZD), and their consistencies were compared. EOZs and planned optical zone (POZ) were compared and analyzed with eccentricity, ablation degree (AD) and total corneal aberrations.

Results

At 3 months after surgery, the mean root mean square of ΔHOA, ΔComa, ΔTrefoil and ΔSA were 0.53 ± 0.27 μm, 0.36 ± 0.20 μm, 0.01 ± 0.84 μm and 0.16 ± 0.14 μm, respectively. EOZV, EOZP, EOZ4 and EOZD were 5.87 ± 0.44 mm, 5.85 ± 0.45 mm, 4.78 ± 0.40 mm and 5.29 ± 0.27 mm, respectively, which were significantly smaller than POZ 6.48 ± 0.16 mm. Bland–Altman plots showed a good consistency among the four EOZs. The difference between the EOZV and EOZP was 0.02 mm within the range of clinically acceptable difference. In addition, the eccentricity was positively correlated with ΔHOA, ΔComa and ΔSA.

Conclusions

All 4 measurement approaches demonstrated the reduction of EOZs compared to POZ. The EOZV was the closest to POZ, followed by EOZP. The ΔEOZs showed no significant difference with eccentricity, AD and corneal aberrations.

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Data availability statement

Data could be available upon request to the corresponding author.

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Acknowledgements

We would like to express our deepest gratitude to all the participants in this study. This work was supported by the Shantou Medical Health, Science and Technology Project Fund (project code: 190615215268728 to L.S.), China.

Funding

This study was funded by the Shantou Medical Health, Science and Technology Project Fund (project code: 190615215268728 to L.S.), China.

Author information

Author notes

  1. Lixia Sun and Hui-Ni Lin have contributed equally to this manuscript.

Authors and Affiliations

  1. Joint Shantou International Eye Center of Shantou University, The Chinese University of Hong Kong, North Dongxia Road, Shantou, 515041, Guangdong, China

    Lixia Sun, Hui-Ni Lin, Tsz Kin Ng, Rui-feng Ji & Riping Zhang

  2. Shantou University Medical College, Shantou, Guangdong, China

    Vishal Jhanji & Tsz Kin Ng

  3. Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong, Hong Kong, Hong Kong

    Vishal Jhanji & Tsz Kin Ng

  4. Department of Ophthalmology, UPMC Eye Center, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA

    Vishal Jhanji

Authors
  1. Lixia Sun
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  2. Hui-Ni Lin
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  3. Vishal Jhanji
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  4. Tsz Kin Ng
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  5. Rui-feng Ji
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  6. Riping Zhang
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Contributions

L.S. and R.Z. conceived and designed the study; H.N.L. and R.J. collected and/or assembled the data; H.N.L. analyzed and interpreted the data and wrote the manuscript; and R.Z., V.J. and T.K.N. critically revised the manuscript.

Corresponding author

Correspondence to Riping Zhang.

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Conflict of interest

The authors declare no potential conflicts of interest.

Ethical approval

The study protocol was approved by the Ethics Committee for Human Medical Research at the Joint Shantou International Eye Center of Shantou University and the Chinese University of Hong Kong.

Informed consent

Informed consent was obtained from all participants in the study.

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Sun, L., Lin, HN., Jhanji, V. et al. Changes in effective optical zone after small-incision lenticule extraction in high myopia. Int Ophthalmol 42, 3703–3711 (2022). https://doi.org/10.1007/s10792-022-02367-6

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  • DOI: https://doi.org/10.1007/s10792-022-02367-6

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