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The change in internal aberrations following myopic corneal laser refractive surgery

  • Refractive Surgery
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Abstract

Background

In virgin eyes, the internal aberrations compensate corneal aberrations, and it has been suggested that the compensation may be feedback-driven and developmental, with active or passive adaptive mechanisms potentially responsible for the aberration auto-compensation. The purpose of this study is to investigate the internal higher order aberrations (HOA) following laser in situ keratomileusis (LASIK).

Methods

Prospective corneal and internal HOA were measured pre-operatively and 6 months post-operatively on 50 consecutive LASIK patients with the OPD-Scan.

Results

There were increases to corneal HOA terms \( {\hbox{Z}}_4^0 \) (0.215 ± 0.092 μm to 0.381 ± 0.180 μm), \( {\hbox{Z}}_6^0 \) (0.002 ± 0.018 μm to 0.049 ± 0.034 μm) and \( {\hbox{Z}}_6^4 \) (0.010 ± 0.017 μm to 0.018 ± 0.016 μm) with corresponding increases to internal HOA terms \( {\hbox{Z}}_4^0 \) (-0.176 ± 0.102 μm to −0.218 ± 0.121 μm), \( {\hbox{Z}}_6^0 \) (0.004 ± 0.022 μm to −0.010 ± 0.036 μm) and \( {\hbox{Z}}_6^4 \) (0.008 ± 0.106 μm to −0.015 ± 0.054 μm). The increases in internal aberrations attenuated the increase in corneal aberrations, providing an overall lower quantity of total aberration. A greater increase in corneal spherical aberration and associated compensation was found to occur with greater degrees of attempted myopic correction.

Conclusion

Corneal spherical aberration and \( {\hbox{Z}}_6^4 \) increased with corresponding increases in the internal spherical aberration and \( {\hbox{Z}}_6^4 \) following LASIK. This may be an active compensatory mechanism of the internal optics to change, in order to reduce the effect of induced corneal HOA.

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Acknowledgement

Funding from the Department for Employment and Learning (DEL), Belfast, Northern Ireland, UK.

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Authors and Affiliations

  1. School of Biomedical Sciences, University of Ulster, Cromore Road, Coleraine, BT52 1SA, UK

    Colm McAlinden

  2. Cathedral Eye Clinic, University of Ulster, 25-51 York Street, Belfast, BT15 1ED, UK

    Colm McAlinden & Jonathan E. Moore

  3. Mater Hospital, Belfast Health and Social Care Trust, Belfast, UK

    Jonathan E. Moore

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  1. Colm McAlinden
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Correspondence to Colm McAlinden.

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The authors have no financial interest in any of the products mentioned in the manuscript. The corresponding author has full control of all primary data, and we agree to allow Graefe's Archive for Clinical and Experimental Ophthalmology to review data upon request.

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McAlinden, C., Moore, J.E. The change in internal aberrations following myopic corneal laser refractive surgery. Graefes Arch Clin Exp Ophthalmol 249, 775–781 (2011). https://doi.org/10.1007/s00417-010-1459-x

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  • DOI: https://doi.org/10.1007/s00417-010-1459-x

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