May 2005
Volume 46, Issue 13
Free
ARVO Annual Meeting Abstract  |   May 2005
Correlation Between Corneal and Total Wavefront Aberrations Measured at Various Optic Zones Pre– and Six Month Post–LASIK
Author Affiliations & Notes
  • R.M. Hazarbassanov
    American Lasers Med Ctr, Rishon–Lezion, Israel
  • A. Grinbaum
    Department of ophthalmology, Sheba Medical Center, Tel–Hashomer, Tel–Aviv, Israel
  • D. Varssano
    Department of ophthalmology, Tel–Aviv Sourasky Medical Center, Tel–Aviv, Israel
  • I. Kaiserman
    Department of ophthalmology, Hadassah University Hospital, Jerusalem, Israel
  • Footnotes
    Commercial Relationships  R.M. Hazarbassanov, None; A. Grinbaum, None; D. Varssano, None; I. Kaiserman, None.
  • Footnotes
    Support  None.
Investigative Ophthalmology & Visual Science May 2005, Vol.46, 850. doi:
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      R.M. Hazarbassanov, A. Grinbaum, D. Varssano, I. Kaiserman; Correlation Between Corneal and Total Wavefront Aberrations Measured at Various Optic Zones Pre– and Six Month Post–LASIK . Invest. Ophthalmol. Vis. Sci. 2005;46(13):850.

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

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Abstract

Abstract: : Purpose:To analyze the correlation between corneal and total wavefront aberrations at various optic zones (OZs) before and after LASIK. Methods: Thirty–one eyes of 20 myopic– astigmatic patients (–1.25D to –7.125D) that underwent LASIK were measured using the Oculus corneal topographer and a Tscherning–type wavefront analyzer pre–operatively and 6 month post–op. Corneal and total wavefront aberrations (WFA) were calculated up to the 6th Zernike order and the high–order aberrations’ root mean square (RMS) was calculated in the same reference plane. Results:There was significant correlation (P<0.05) between the LASIK induced corneal aberrations and the total WFA for coma–like aberration at 3rd (OZs 5>4>6), 4th (OZs 5>6>4), 6th (OZs 5>6>4) order Zernike coefficients, for spherical aberrations at all OZ’s (5>6>4) and for total WFA RMS (OZ’s 5>6>4). The fraction of LASIK induced total WFA atributed to the cornea was largest for OZ=5. We also found a strong correlation between the LASIK induced change in the RMS of high–order WFA (OZ=5mm) and the changes in corneal topography’s keratoconus index, Q–mean value and mean keratometry. Conclusions: Some LASIK induced aberrations in the mid periphery (4–6mm), such as coma and spherical, are mostly of corneal origin while others are not. Thus, ideal customized ablations algorithms must take both corneal and total wavefront aberrations into consideration.

Keywords: refractive surgery: LASIK • refractive surgery: corneal topography • refractive surgery: optical quality 
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