Total and corneal optical aberrations induced by laser in situ keratomileusis for hyperopia

Lourdes Llorente, Sergio Barbero, Jesus Merayo, Susana Marcos

Research output: Contribution to journalArticle

95 Citations (Scopus)

Abstract

PURPOSE: To evaluate changes induced by standard laser in situ keratomileusis (LASIK) for hyperopia on total and corneal optical quality. METHODS: Total and corneal aberrations were measured before and after standard hyperopic LASIK in 13 eyes (preoperative spherical equivalent refractive error +3.17 ± 1.10 D). The Chiron Technolas 217C laser with PlanoScan was used. Total aberrations (measured using laser ray tracing) and corneal aberrations (estimated from a videokeratoscope) were described using Zernike terms. Root-mean-square wavefront error for both total and corneal aberrations, and through-focus Strehl ratio for the point spread function of the whole eye were used to assess optical changes induced by surgery. RESULTS: Third and higher order aberrations increased significantly after hyperopic LASIK (by a factor of 2.20 for total and 1.78 for corneal aberrations, for a 6.5-mm pupil). Spherical aberration changed to negative values (corneal average decreased by -0.85 ± 0.48 μm and total average by -0.70 ± 0.30 μm). Best Strehl ratio for the whole eye decreased by a factor of 1.84. Hyperopic LASIK induced larger changes than myopic LASIK, compared to an equivalent group of myopic eyes from a previous study. Induced corneal spherical aberration was six times larger after hyperopic LASIK, for a similar range of correction, and of opposite sign. As with myopic LASIK, changes in internal spherical aberration are of opposite sign to those induced on the corneal anterior surface. CONCLUSIONS: Hyperopic LASIK induced significant amounts of aberrations. The largest increase occurred in spherical aberration, which showed a shift (toward negative values) of opposite sign; increase was greater than for myopic LASIK.

Original languageEnglish
Pages (from-to)203-216
Number of pages14
JournalJournal of Refractive Surgery
Volume20
Issue number3
Publication statusPublished - Apr 2004
Externally publishedYes

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Hyperopia
Laser In Situ Keratomileusis
Lasers
Refractive Errors
Pupil

ASJC Scopus subject areas

  • Ophthalmology

Cite this

Llorente, L., Barbero, S., Merayo, J., & Marcos, S. (2004). Total and corneal optical aberrations induced by laser in situ keratomileusis for hyperopia. Journal of Refractive Surgery, 20(3), 203-216.

Total and corneal optical aberrations induced by laser in situ keratomileusis for hyperopia. / Llorente, Lourdes; Barbero, Sergio; Merayo, Jesus; Marcos, Susana.

In: Journal of Refractive Surgery, Vol. 20, No. 3, 04.2004, p. 203-216.

Research output: Contribution to journalArticle

Llorente, L, Barbero, S, Merayo, J & Marcos, S 2004, 'Total and corneal optical aberrations induced by laser in situ keratomileusis for hyperopia', Journal of Refractive Surgery, vol. 20, no. 3, pp. 203-216.
Llorente, Lourdes ; Barbero, Sergio ; Merayo, Jesus ; Marcos, Susana. / Total and corneal optical aberrations induced by laser in situ keratomileusis for hyperopia. In: Journal of Refractive Surgery. 2004 ; Vol. 20, No. 3. pp. 203-216.
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