May 2003
Volume 44, Issue 13
Free
ARVO Annual Meeting Abstract  |   May 2003
Lasik Decentration with Assisted Ablation versus Manual Ablation
Author Affiliations & Notes
  • R.A. Yee Chan
    Cornea and Refractive Surgery, Hospital NSTRA Sra De La Luz, Mexico City, Mexico
  • O. Baca
    Cornea and Refractive Surgery, Hospital NSTRA Sra De La Luz, Mexico City, Mexico
  • R. Velasco
    Cornea and Refractive Surgery, Hospital NSTRA Sra De La Luz, Mexico City, Mexico
  • D. Viggiano
    Cornea and Refractive Surgery, Hospital NSTRA Sra De La Luz, Mexico City, Mexico
  • R. Hernandez
    Cornea and Refractive Surgery, Hospital NSTRA Sra De La Luz, Mexico City, Mexico
  • Footnotes
    Commercial Relationships  R.A. Yee Chan, None; O. Baca, None; R. Velasco, None; D. Viggiano, None; R. Hernandez, None.
  • Footnotes
    Support  RAYEE969
Investigative Ophthalmology & Visual Science May 2003, Vol.44, 2580. doi:
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      R.A. Yee Chan, O. Baca, R. Velasco, D. Viggiano, R. Hernandez; Lasik Decentration with Assisted Ablation versus Manual Ablation . Invest. Ophthalmol. Vis. Sci. 2003;44(13):2580.

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

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Abstract

Abstract: : Purpose: to evaluate LASIK ablation decentration with assisted ablation (AA) versus manual ablation (MA). Methods: Two hundred and eighty eyes operated with LASIK in the Cornea department at the "Fundación Hospital Nuestra Señora de la Luz" were chosen, 140 eyes with AA with the Chiron Technolas 217 and 140 eyes with MA with the Visx Star S2. We measure the degree, direction, quantity of decentration and the relation with the degree of refractive error (RE). We classified the degree of decentration in mild (1-5 mm), moderate (6-10 mm) and severe (11 or more mm). We classified the RE with spherical equivalent. Statistical analysis was done with chi square and t student test. Results: Twenty-four eyes were off-center with AA, and 31 eyes with MA. Moderate decentration was more frequent with AA; mild decentration was more frequent with MA. Superior decentration was most common for both techniques. Thirty percent of the decentrations were mixed. Most off-center eyes had moderate to severe myopia in both ablations. There were no cases of decentration in hyperopia. Mean decentration was 6 mm for both techniques. No statistical differences were found for decentration degree, direction, quantity and the RE associated in either ablation. Conclusions: We could not prove any advantage of the AA over the MA.

Keywords: refractive surgery: LASIK • refractive surgery: complications • refractive surgery: comparative studies 
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