May 2008
Volume 49, Issue 13
Free
ARVO Annual Meeting Abstract  |   May 2008
Influence of the Compensation for Pupil Decentration and Ocular Rotation on the Residual Ocular Aberrations in Myopic Astigmatic Patients After Wavefront-Guided Refractive Surgery
Author Affiliations & Notes
  • P.-J. Pisella
    Ophthalmology, University Hospital of Tours, Tours, France
  • D. Marotte
    Ophthalmology, University Hospital of Tours, Tours, France
  • A. Denoyer
    Ophthalmology, University Hospital of Tours, Tours, France
  • Footnotes
    Commercial Relationships  P. Pisella, None; D. Marotte, None; A. Denoyer, None.
  • Footnotes
    Support  None.
Investigative Ophthalmology & Visual Science May 2008, Vol.49, 2907. doi:https://doi.org/
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      P.-J. Pisella, D. Marotte, A. Denoyer; Influence of the Compensation for Pupil Decentration and Ocular Rotation on the Residual Ocular Aberrations in Myopic Astigmatic Patients After Wavefront-Guided Refractive Surgery. Invest. Ophthalmol. Vis. Sci. 2008;49(13):2907. doi: https://doi.org/.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose: : To evaluate if compensating ocular misalignments during wavefront-guided excimer ablation could improve the postoperative ocular wavefront profile.

Methods: : Sixty-nine eyes with myopic astigmatism superior to 1D were included. 32 eyes underwent wavefront-guided (WG) excimer ablations (15 LASIK and 17 PRKs) with iris-guided compensation (IGC) for pupil decentration and ocular rotation (VISX Star S4-IR and CustomVue, VISX, USA), and the others underwent WG surgery (18 LASIK and 19 PRKs) without IGC, as controls. Ocular lower- and higher-order wavefront aberrations were measured before and six months after the surgery. Data were computed, rescaled for pupil size, and vectorial analyses were performed to evaluate the surgically-induced changes in main aberrations (astigmatism, coma, and trefoil).

Results: : Mean intraoperative misalignments were 0.2±0.1 mm for pupil decentration and 3±1.9 degrees for rotation. Residual magnitude of the 2nd-order astigmatism was lower in IGC group (p<0.001), so was the error of treatment axis (p=0.01). Postoperative root mean square of higher-order aberrations was inferior in IGC group (p=0.005) than in controls. Surgically-induced changes in coma and trefoil aberrations have been detailed for magnitude and axis.

Conclusions: : Compensating ocular misalignments during WG refractive surgery reduces the residual astigmatism, and optimises the treatment of higher-order aberrations in myopic astigmatic patients.

Keywords: refractive surgery • refractive error development • refractive surgery: optical quality 
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