Vector analysis of astigmatism before and after LASIK: a comparison of two different platforms for treatment of high astigmatism.

Abstract

PURPOSE:

To compare the outcomes of astigmatic laser in-situ keratomileusis (LASIK) procedures between two different platforms using J0 and J45 vector analysis.

METHODS:

Patients were divided into four groups, depending on the type of astigmatism and laser platform on which they were treated. Astigmatism was between 2 and 7 diopters (D). One hundred and thirty-five patients with myopic astigmatism (246 eyes) and 102 patients with mixed astigmatism (172 eyes) underwent unremarkable LASIK correction on Wavelight Allegretto Eye-Q 400Hz and Schwind Amaris 750S laser platform. The preoperative and postoperative sphere, negative cylinder [C] and axis (ø) of manifest refractions were subjected to vector analysis by calculations of the standard J0 (cos [4π(ø-90)/360]xC/2) and J45 (sin[4π(ø-90)/360]xC/2).

RESULTS:

Reporting the key results, we found J0 significantly reduced after LASIK in both groups (p < 0.001) but not J45. There was no significant association between individual pairs of pre and postoperative J0 & J45 values. There was no significant difference between the outcomes of the two platforms.

CONCLUSIONS:

Wavelight Allegretto 400Hz and Schwind Amaris 750S showed excellent results for treating patients with astigmatism, regardless whether it is mixed or myopic astigmatism. The J45 did not reduce significantly possibly because of the low number of eyes with oblique astigmatism. There was no genuine difference post-operatively between groups treated on two different laser platforms according to the vector analyses.

• Authors: Alma Biscevic, Maja Bohac, Mateja Koncarevic, Marija Anticic, Iva Dekaris, Sudi Patel
• Journal: Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie (Graefes Arch Clin Exp Ophthalmol) Vol. 253 Issue 12 Pg. 2325-33 (Dec 2015) ISSN: 1435-702X [Electronic] Germany
• PMID: 26400154 (Publication Type: Comparative Study, Journal Article)

Topics

• Adult
• Astigmatism (physiopathology, surgery)
• Cornea (physiopathology)
• Female
• Humans
• Keratomileusis, Laser In Situ (methods)
• Lasers, Excimer (therapeutic use)
• Male
• Myopia (physiopathology, surgery)
• Postoperative Period
• Preoperative Period
• Prospective Studies
• Refraction, Ocular (physiology)
• Treatment Outcome
• Visual Acuity (physiology)