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Corneal power measurement with a new aberrometer/corneal topographer in eyes after small incision lenticule extraction for myopia

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Abstract

Purpose

To assess corneal power measurements obtained by the OPD SCAN III Topographer in eyes with prior myopic small incision lenticule extraction (SMILE) surgery.

Methods

Sixty untreated myopic eyes of sixty subjects and forty previous myopic SMILE surgery eyes of forty subjects were consecutively enrolled in the present study. Manifest refraction, OPD SCAN III and Pentacam HR were performed. Keratometric measurements assessed by OPD SCAN III—simulated keratometry, average pupil power and effective central corneal power (ECCP) were compared with mean keratometry (Km) obtained by Pentacam HR in the untreated group and the clinical history method (CHM) in the treated group.

Results

In the untreated group, no statistically significant differences were revealed between all corneal power measurements obtained with OPD SCAN III and Km. In the treated group, all the corneal power measurements were statistically different from the CHM except for the Haigis method and the Shammas method, while ECCP had a statistically but not clinically significant overestimation of 0.42 D with 95% limit of agreement (LOA) of − 0.81 D to 1.64 D. The three modified ECCP had better prediction performance with narrower 95% of LOA lying in (− 1.20, 1.20 D) (− 1.22, 1.23 D) and (− 0.90, 1.00 D), respectively.

Conclusions

The ECCP provided with OPD SCAN III could be used as an alternative option for the CHM after specific modifications in eyes with previous myopic SMILE surgery when the preoperative data are unavailable considering the narrowest agreement between the modified ECCP and the CHM. Otherwise, caution must be raised considering the wide LOA.

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Author notes

  1. Chao Pan and Weina Tan have contributed equally to this study and share first authorship.

Authors and Affiliations

  1. Hankou Aier Eye Hospital, 34 Machang Road, Jianghan District, Wuhan, Hubei Province, China

    Chao Pan, Weina Tan & Xiaohua Lei

  2. Department of Ophthalmology, Shanghai Jiao Tong University Affiliated Sixth People’s Hospital, Xuhui District, Shanghai, China

    Yanjun Hua

Authors
  1. Chao Pan
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  2. Weina Tan
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  3. Yanjun Hua
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  4. Xiaohua Lei
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Correspondence to Xiaohua Lei.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.

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

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Pan, C., Tan, W., Hua, Y. et al. Corneal power measurement with a new aberrometer/corneal topographer in eyes after small incision lenticule extraction for myopia. Int Ophthalmol 39, 2815–2824 (2019). https://doi.org/10.1007/s10792-019-01128-2

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  • DOI: https://doi.org/10.1007/s10792-019-01128-2

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