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Vector analysis of astigmatism before and after LASIK: a comparison of two different platforms for treatment of high astigmatism

  • Refractive Surgery
  • Published:
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Abstract

Purpose

To compare the outcomes of astigmatic laser in-situ keratomileusis (LASIK) procedures between two different platforms using J0 and J45 vector analysis.

Methods

Patients were divided into four groups, depending on the type of astigmatism and laser platform on which they were treated. Astigmatism was between 2 and 7 diopters (D). One hundred and thirty-five patients with myopic astigmatism (246 eyes) and 102 patients with mixed astigmatism (172 eyes) underwent unremarkable LASIK correction on Wavelight Allegretto Eye-Q 400Hz and Schwind Amaris 750S laser platform. The preoperative and postoperative sphere, negative cylinder [C] and axis (ø) of manifest refractions were subjected to vector analysis by calculations of the standard J0 (cos [4π(ø-90)/360]xC/2) and J45 (sin[4π(ø-90)/360]xC/2).

Results

Reporting the key results, we found J0 significantly reduced after LASIK in both groups (p < 0.001) but not J45. There was no significant association between individual pairs of pre and postoperative J0 & J45 values. There was no significant difference between the outcomes of the two platforms.

Conclusions

Wavelight Allegretto 400Hz and Schwind Amaris 750S showed excellent results for treating patients with astigmatism, regardless whether it is mixed or myopic astigmatism. The J45 did not reduce significantly possibly because of the low number of eyes with oblique astigmatism. There was no genuine difference post-operatively between groups treated on two different laser platforms according to the vector analyses.

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Funding

No funding was received for this research.

Conflict of interest

All authors certify that they have no affiliations with or involvement in any organization or entity with any financial interest (such as honoraria, educational grants; participation in speakers’ bureaus; membership, employment, consultancies, stock ownership, or other equity interest; and expert testimony or patent-licensing arrangements), or non-financial interest (such as personal or professional relationships, affiliations, knowledge, or beliefs) in the subject matter or materials discussed in this manuscript.

Financial Disclosure

None of the authors have a financial interest in any of the products or devices noted in this paper.

Ethical approval

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

Informed consent

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

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Authors and Affiliations

  1. Specialty Eye Hospital “Svjetlost”, Heinzelova 39, 10000, Zagreb, Croatia

    Alma Biscevic, Maja Bohac, Mateja Koncarevic, Marija Anticic, Iva Dekaris & Sudi Patel

  2. NHS National Services Scotland, Edinburgh, UK

    Sudi Patel

Authors
  1. Alma Biscevic
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  2. Maja Bohac
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  3. Mateja Koncarevic
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  4. Marija Anticic
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  5. Iva Dekaris
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  6. Sudi Patel
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Corresponding author

Correspondence to Alma Biscevic.

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Biscevic, A., Bohac, M., Koncarevic, M. et al. Vector analysis of astigmatism before and after LASIK: a comparison of two different platforms for treatment of high astigmatism. Graefes Arch Clin Exp Ophthalmol 253, 2325–2333 (2015). https://doi.org/10.1007/s00417-015-3177-x

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  • DOI: https://doi.org/10.1007/s00417-015-3177-x

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