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Effect of corneal curvature on optical zone decentration and its impact on astigmatism and higher-order aberrations in SMILE and LASIK.
- Source :
-
Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie [Graefes Arch Clin Exp Ophthalmol] 2019 Jan; Vol. 257 (1), pp. 233-240. Date of Electronic Publication: 2018 Oct 27. - Publication Year :
- 2019
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Abstract
- Purpose: To determine the association between anterior corneal curvature and optical zone centration as well as its impact on aberration profiles in small-incision lenticule extraction (SMILE) and laser in situ keratomileusis (LASIK).<br />Methods: Seventy-eight eyes of 78 patients treated with SMILE (45 eyes) and LASIK (33 eyes) were included. The centration of the optical zone was evaluated on the instantaneous curvature difference map between the preoperative and 3-month postoperative scans using a superimposed set of concentric circles. The correlation between optical zone decentration and anterior keratometry values was evaluated. The effect of optical zone decentration on vector components of astigmatic correction and induction of higher-order aberrations (HOA) was assessed.<br />Results: The mean decentration distance was 0.21 ± 0.11 mm for SMILE and 0.20 ± 0.09 mm for LASIK (p = 0.808). There was a significant correlation between anterior keratometric astigmatism and decentration distance (r = 0.653, p < 0.001) for SMILE but not for LASIK (r = - 0.264, p = 0.138). Astigmatic correction was performed in 67 eyes. Optical zone decentration and the vector components of astigmatic correction were not correlated (p ≥ 0.420). Significant correlation was demonstrated between the decentration distance and the induced total coma (SMILE: r = 0.384, p = 0.009; LASIK: r = 0.553, p = 0.001) as well as the induced total HOA (SMILE: r = 0.498, p = 0.001; LASIK: r = 0.555, p = 0.001).<br />Conclusion: Anterior cornea astigmatism affected the treatment centration in SMILE but not LASIK. Subclinical decentration was associated with the induction of total coma and total HOA, but it did not affect the lower-order astigmatic correction.
- Subjects :
- Adult
Astigmatism pathology
Astigmatism physiopathology
Cornea surgery
Corneal Topography
Corneal Wavefront Aberration diagnosis
Corneal Wavefront Aberration physiopathology
Female
Humans
Male
Postoperative Period
Prospective Studies
Astigmatism surgery
Cornea pathology
Corneal Wavefront Aberration surgery
Keratomileusis, Laser In Situ methods
Lasers, Excimer therapeutic use
Refraction, Ocular physiology
Visual Acuity
Subjects
Details
- Language :
- English
- ISSN :
- 1435-702X
- Volume :
- 257
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie
- Publication Type :
- Academic Journal
- Accession number :
- 30368563
- Full Text :
- https://doi.org/10.1007/s00417-018-4165-8