Factors affecting the change in lower-order and higher-order aberrations after wavefront-guided laser in situ keratomileusis for myopia with the Zyoptix 3.1 system

Bühren, Jens; Kohnen, Thomas

doi:10.1016/j.jcrs.2006.01.098

Cited by 49 publications

(24 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Few published studies have discussed the effect of age on changes in higher-order aberrations after refractive surgery. Buhren and Kohnen 35 found that age did not influence changes in higher-order aberrations after wavefrontguided LASIK, while we found age correlated inversely with changes in higherorder aberrations with strong significance for 3.0 mm but not 5.0 mm pupils. This result implies that age might influence changes in higher-order aberrations in the central cornea after conventional laser refractive surgery.…”

Section: Discussioncontrasting

confidence: 58%

Anterior corneal optical irregularity measured by higher‐order aberrations induced by a broad beam excimer laser

Hsieh

Wang

2012

Clinical and Experimental Optometry

View full text Add to dashboard Cite

Background:The aim was to analyse anterior corneal optical irregularity in patients receiving photorefractive keratectomy (PRK) and laser in situ keratomileusis (LASIK) with a conventional broad beam laser. Methods: Pre-and post-operative anterior corneal aberrations including Zernike coefficients and root mean squares of higher-order aberrations were measured and derived with a Placido-ring-based corneal topographer and wavefront software, respectively, from 768 right eyes of patients receiving either PRK or LASIK for myopia with a conventional broad beam excimer laser in National Taiwan University Hospital, Taipei, Taiwan. Multiple linear regression models selected by Mallows' Cp criteria were used to evaluate predictability of surgically induced aberrations and relevant factors. Results: Mean attempted spherical equivalent correction was -7.37 Ϯ 2.33 D (range: -16.5 to -1.95). Root mean squares of higher-order aberrations and variances of Zernike coefficients all increased significantly after surgery (p < 0.01). All post-operative higherorder aberrations increased with the amount of attempted myopic correction and secondary astigmatism increased with attempted cylindrical correction. LASIK surgery induced less coma and third-order aberrations but more fifth-and sixth-order aberrations than PRK, although squared partial correlation coefficients were low. Larger optic and transitional zones meant fewer higher-order aberrations after surgery. Younger patients tended to have more surgically induced aberrations in the 3.0 mm pupil zone. Conclusions: Anterior corneal optical irregularity increased tremendously after refractive surgery by conventional broad beam lasers and correlated with greater attempted myopic correction, younger age and a smaller treatment zone. The effect of corneal flaps on post-operative corneal irregularity differed trivially.

show abstract

Section: Discussioncontrasting

confidence: 58%

Anterior corneal optical irregularity measured by higher‐order aberrations induced by a broad beam excimer laser

Hsieh

Wang

2012

Clinical and Experimental Optometry

View full text Add to dashboard Cite

show abstract

“…2 Small optical zones can lead to postoperative optical phenomena such as loss of contrast sensitivity, glare, halos, and star bursts or can decrease mesopic visual acuity. 3 In cases of high myopia, the need for large optical zones leads to a large amount of stromal ablation and thus an increased risk for corneal ectasia due to instability of corneal biomechanics 4 or undetected corneal irregularities. 4,5 Phakic intraocular lens (pIOL) implantation is an option for correcting moderate to high myopia and hyperopia.…”

mentioning

confidence: 99%

Three-year stability of an angle-supported foldable hydrophobic acrylic phakic intraocular lens evaluated by Scheimpflug photography

Kohnen¹,

Klaproth²

2010

Journal of Cataract and Refractive Surgery

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, this surgical technique has limited application in high myopia, especially ultra-high myopia, and it cannot be performed in patients with thin corneas, corneal pannus spots, and large astigmatism. Laser surgery for high myopia requires cutting away the excess corneal tissue, resulting in large changes in the tissue morphologies of the anterior corneal surface and potentially causing serious complications such as aberration rollback, corneal ectasia, keratoconus, and significantly decreased visual quality [17]. Furthermore, patients with a high long-term risk of developing a corneal flap, such as athletes and stuntmen, should not be considered for laser surgery.…”

Section: Discussionmentioning

confidence: 99%

Therapeutic effectiveness of toric implantable collamer lens in treating ultrahigh myopic astigmatism

Li¹,

Li²,

Liu³

et al. 2018

biomedicalresearch

View full text Add to dashboard Cite

With a rapid increase in the prevalence of Ultra-High Myopic Astigmatism (UHMA), especially in the youth, there have been many studies on visual correction. In our study, we investigated the clinical value of the Toric Implantable Collamer Lens (TICL) in UHMA. We conducted a retrospective study between 2011 and 2013. TICL implantation was performed on fifteen UHMA patients (30 eyes), and all these patients were regularly followed up for 12 months. The preoperative and postoperative data, including Uncorrected Visual Acuity (UCVA), Best Corrected Visual Acuity (BCVA), Intraocular Pressure (IOP), and corneal endothelial counts, were all analysed using the paired-sample t-test. The 12-month spherical mirror (SPH) of the surgical eye was -0.25~+0.25 D, and the Cylinder mirror (CYL) was 0~-0.50 D. Twenty patients exhibited an increase in UCVA by one level in comparison to the preoperative BCVA, amounting to a 66.7% increase; 20.0% of patients exhibited an increase in UCVA by two levels. A comparison between the preoperative and postoperative IOP showed no statistically significant difference. No difference was also found in mean corneal endothelial counts before and after the operation. A decrease in visual acuity was observed in one eye at the 3 rd -month of review; this was corrected by TICL position adjustment. Precisely measuring the preoperative parameters, selecting the appropriate TICL, more thoroughly aspirating sodium hyaluronate intraoperatively, and maintaining a stable IOP were important for maintaining the effectiveness, safety and stability of TICL in treating UHMA.

show abstract

Factors affecting the change in lower-order and higher-order aberrations after wavefront-guided laser in situ keratomileusis for myopia with the Zyoptix 3.1 system

Cited by 49 publications

References 37 publications

Anterior corneal optical irregularity measured by higher‐order aberrations induced by a broad beam excimer laser

Anterior corneal optical irregularity measured by higher‐order aberrations induced by a broad beam excimer laser

Three-year stability of an angle-supported foldable hydrophobic acrylic phakic intraocular lens evaluated by Scheimpflug photography

Therapeutic effectiveness of toric implantable collamer lens in treating ultrahigh myopic astigmatism

Contact Info

Product

Resources

About