Clinical outcomes of laser in situ keratomileusis using combined topography and refractive wavefront treatments for myopic astigmatism

Abstract

The WF&VP group had greater reduction in corneal astigmatism and better visual outcomes under mesopic conditions than the WF group and equivalent higher-order aberrations.

New method of quantifying corneal topographic astigmatism that corresponds with manifest refractive cylinder

“…In any case, when the ORA may be significant, the treatment paradigm can be adjusted to combine the corneal astigmatism into the refractive treatment plan when performing corneal surgery with the technique of vector planning. 3,[8][9][10][15][16][17] Clinical studies involving excimer laser treatment are required to reinforce the CorT findings presented in this paper.…”

Vector analysis of astigmatic changes after cataract surgery with toric intraocular lens implantation

“…It can be determined whether the treatment was on axis or off axis and whether too much or too little effect was achieved. The Alpins method has been used by several authors to analyze the astigmatic changes induced with different surgical and nonsurgical options, including relaxing incisions, 34,35 excimer laser refractive surgery, [36][37][38][39][40] cataract surgery, 41 vitrectomy, 42 orthokeratology. 43 The information obtained with this analysis can help optimize the selection of toric IOL power and define predictive factors for a good visual outcome after cataract surgery with implantation of these IOLs.…”

Efficacy of laser in situ keratomileusis in correcting anterior and non-anterior corneal astigmatism: Comparative study

“…Our study is unique in that it differentiates the efficacy of astigmatic correction based on the location of the astigmatism on the visual axis and derives an index of success for each type. Several studies have assessed the effectiveness of correcting HOAs measured by wavefront and the secondary impact on anterior corneal astigmatism [10][11][12][13][14][15][16] ; however, to our knowledge, ours is the only study to assess the effect of treating only LOAs on the anterior cornea and the relationship between the treatment's efficacy and the origin and location of the astigmatism preoperatively. The results are equally relevant to wavefrontguided treatments.…”

“…It is also important that the surgeon be aware that LASIK may iatrogenically create an excessively astigmatic cornea that can reduce postoperative visual quality. Therefore, the appropriate treatment for eyes with high ORA may be to use vector planning, as proposed and studied by Alpins 10 and Alpins and Stamatelatos, 11,12 to treat both corneal and refractive astigmatism, resulting in less induced corneal astigmatism. Alternatively, the more appropriate treatment in such eyes may be a lens-based procedure, thus avoiding corneal treatment altogether.…”