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Effect of corneal curvature on optical zone decentration and its impact on astigmatism and higher-order aberrations in SMILE and LASIK

  • Refractive Surgery
  • Published:
Graefe's Archive for Clinical and Experimental Ophthalmology Aims and scope Submit manuscript

Abstract

Purpose

To determine the association between anterior corneal curvature and optical zone centration as well as its impact on aberration profiles in small-incision lenticule extraction (SMILE) and laser in situ keratomileusis (LASIK).

Methods

Seventy-eight eyes of 78 patients treated with SMILE (45 eyes) and LASIK (33 eyes) were included. The centration of the optical zone was evaluated on the instantaneous curvature difference map between the preoperative and 3-month postoperative scans using a superimposed set of concentric circles. The correlation between optical zone decentration and anterior keratometry values was evaluated. The effect of optical zone decentration on vector components of astigmatic correction and induction of higher-order aberrations (HOA) was assessed.

Results

The mean decentration distance was 0.21 ± 0.11 mm for SMILE and 0.20 ± 0.09 mm for LASIK (p = 0.808). There was a significant correlation between anterior keratometric astigmatism and decentration distance (r = 0.653, p < 0.001) for SMILE but not for LASIK (r = − 0.264, p = 0.138). Astigmatic correction was performed in 67 eyes. Optical zone decentration and the vector components of astigmatic correction were not correlated (p ≥ 0.420). Significant correlation was demonstrated between the decentration distance and the induced total coma (SMILE: r = 0.384, p = 0.009; LASIK: r = 0.553, p = 0.001) as well as the induced total HOA (SMILE: r = 0.498, p = 0.001; LASIK: r = 0.555, p = 0.001).

Conclusion

Anterior cornea astigmatism affected the treatment centration in SMILE but not LASIK. Subclinical decentration was associated with the induction of total coma and total HOA, but it did not affect the lower-order astigmatic correction.

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Author notes

  1. Tommy C. Y. Chan and Kelvin H. Wan contributed equally to this work.

Authors and Affiliations

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

    Tommy C. Y. Chan, Kelvin H. Wan & Tiffany H. K. Tso

  2. Eyereum Eye Clinic, Seoul, South Korea

    David S. Y. Kang

  3. Hong Kong Laser Eye Center, Hong Kong, Hong Kong

    George P. M. Cheng

  4. Tianjin Eye Hospital & Eye Institute, Tianjin, China

    Yan Wang

Authors
  1. Tommy C. Y. Chan
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  2. Kelvin H. Wan
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  5. George P. M. Cheng
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  6. Yan Wang
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Correspondence to Tommy C. Y. Chan.

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The authors declare that they have no conflict of interest.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. For this type of study, formal consent is not required.

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Informed consent was obtained from all individual participants included in the study.

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Chan, T.C.Y., Wan, K.H., Kang, D.S.Y. et al. Effect of corneal curvature on optical zone decentration and its impact on astigmatism and higher-order aberrations in SMILE and LASIK. Graefes Arch Clin Exp Ophthalmol 257, 233–240 (2019). https://doi.org/10.1007/s00417-018-4165-8

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  • DOI: https://doi.org/10.1007/s00417-018-4165-8

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