Optical response to LASIK surgery for myopia from total and corneal aberration measurements

Susana Marcos, Sergio Barbero, Lourdes Llorente, Jesús Merayo-Lloves

Research output: Contribution to journalArticle

247 Citations (Scopus)

Abstract

PURPOSE. To evaluate the optical aberrations induced by LASIK refractive surgery for myopia on the anterior surface of the cornea and the entire optical system of the eye. METHODS. Total and corneal aberrations were measured in a group of 14 eyes (preoperative myopia ranging from -2.5 to -13 D) before and after LASIK surgery. Total aberrations were measured using a laser ray-tracing technique. Corneal aberrations were obtained from corneal elevation maps measured using a corneal system and custom software. Corneal and total wave aberrations were described as Zcrnike polynomial expansions. Root-mean-square (RMS) wavefront error was used as a global optical quality metric. RESULTS. Total and corneal aberrations (third-order and higher) showed a statistically significant increase after LASIK myopia surgery, by a factor of 1.92 (total) and 3.72 (corneal), on average. This increase was more pronounced in patients with the highest preoperative myopia. There is a good correlation (r = 0.97, P < 0.0001) between the aberrations induced in the entire optical system and those induced in the anterior corneal surface. However, the anterior corneal spherical aberration increased more than the total spherical aberration, suggesting also a change in the spherical aberration of the posterior corneal surface. Pupil centration and internal optical aberrations, which are not accounted for in corneal topography, play an important role in evaluating individual surgical outcomes. CONCLUSIONS. Because LASIK surgery induces changes in the anterior corneal surface, most changes in the total aberration pattern can be attributed to changes in the anterior corneal aberrations. However, because of individual interactions of the aberrations in the ocular components, a combination of corneal and total aberration measurements is critical to understanding individual outcomes, and by extension, to designing custom ablation algorithms. This comparison also reveals changes in the internal aberrations, consistent with the posterior corneal changes reported using scanning slit corneal topography.

Original languageEnglish
Pages (from-to)3349-3356
Number of pages8
JournalInvestigative Ophthalmology and Visual Science
Volume42
Issue number13
Publication statusPublished - 2001
Externally publishedYes

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Laser In Situ Keratomileusis
Myopia
Corneal Topography
Optical Devices
Refractive Surgical Procedures
Pupil
Cornea
Lasers
Software

ASJC Scopus subject areas

  • Ophthalmology

Cite this

Optical response to LASIK surgery for myopia from total and corneal aberration measurements. / Marcos, Susana; Barbero, Sergio; Llorente, Lourdes; Merayo-Lloves, Jesús.

In: Investigative Ophthalmology and Visual Science, Vol. 42, No. 13, 2001, p. 3349-3356.

Research output: Contribution to journalArticle

Marcos, S, Barbero, S, Llorente, L & Merayo-Lloves, J 2001, 'Optical response to LASIK surgery for myopia from total and corneal aberration measurements', Investigative Ophthalmology and Visual Science, vol. 42, no. 13, pp. 3349-3356.
Marcos, Susana ; Barbero, Sergio ; Llorente, Lourdes ; Merayo-Lloves, Jesús. / Optical response to LASIK surgery for myopia from total and corneal aberration measurements. In: Investigative Ophthalmology and Visual Science. 2001 ; Vol. 42, No. 13. pp. 3349-3356.
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N2 - PURPOSE. To evaluate the optical aberrations induced by LASIK refractive surgery for myopia on the anterior surface of the cornea and the entire optical system of the eye. METHODS. Total and corneal aberrations were measured in a group of 14 eyes (preoperative myopia ranging from -2.5 to -13 D) before and after LASIK surgery. Total aberrations were measured using a laser ray-tracing technique. Corneal aberrations were obtained from corneal elevation maps measured using a corneal system and custom software. Corneal and total wave aberrations were described as Zcrnike polynomial expansions. Root-mean-square (RMS) wavefront error was used as a global optical quality metric. RESULTS. Total and corneal aberrations (third-order and higher) showed a statistically significant increase after LASIK myopia surgery, by a factor of 1.92 (total) and 3.72 (corneal), on average. This increase was more pronounced in patients with the highest preoperative myopia. There is a good correlation (r = 0.97, P < 0.0001) between the aberrations induced in the entire optical system and those induced in the anterior corneal surface. However, the anterior corneal spherical aberration increased more than the total spherical aberration, suggesting also a change in the spherical aberration of the posterior corneal surface. Pupil centration and internal optical aberrations, which are not accounted for in corneal topography, play an important role in evaluating individual surgical outcomes. CONCLUSIONS. Because LASIK surgery induces changes in the anterior corneal surface, most changes in the total aberration pattern can be attributed to changes in the anterior corneal aberrations. However, because of individual interactions of the aberrations in the ocular components, a combination of corneal and total aberration measurements is critical to understanding individual outcomes, and by extension, to designing custom ablation algorithms. This comparison also reveals changes in the internal aberrations, consistent with the posterior corneal changes reported using scanning slit corneal topography.

AB - PURPOSE. To evaluate the optical aberrations induced by LASIK refractive surgery for myopia on the anterior surface of the cornea and the entire optical system of the eye. METHODS. Total and corneal aberrations were measured in a group of 14 eyes (preoperative myopia ranging from -2.5 to -13 D) before and after LASIK surgery. Total aberrations were measured using a laser ray-tracing technique. Corneal aberrations were obtained from corneal elevation maps measured using a corneal system and custom software. Corneal and total wave aberrations were described as Zcrnike polynomial expansions. Root-mean-square (RMS) wavefront error was used as a global optical quality metric. RESULTS. Total and corneal aberrations (third-order and higher) showed a statistically significant increase after LASIK myopia surgery, by a factor of 1.92 (total) and 3.72 (corneal), on average. This increase was more pronounced in patients with the highest preoperative myopia. There is a good correlation (r = 0.97, P < 0.0001) between the aberrations induced in the entire optical system and those induced in the anterior corneal surface. However, the anterior corneal spherical aberration increased more than the total spherical aberration, suggesting also a change in the spherical aberration of the posterior corneal surface. Pupil centration and internal optical aberrations, which are not accounted for in corneal topography, play an important role in evaluating individual surgical outcomes. CONCLUSIONS. Because LASIK surgery induces changes in the anterior corneal surface, most changes in the total aberration pattern can be attributed to changes in the anterior corneal aberrations. However, because of individual interactions of the aberrations in the ocular components, a combination of corneal and total aberration measurements is critical to understanding individual outcomes, and by extension, to designing custom ablation algorithms. This comparison also reveals changes in the internal aberrations, consistent with the posterior corneal changes reported using scanning slit corneal topography.

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