Analysis of excimer laser treatment outcomes and corresponding angle κ in hyperopic astigmatism

Фрингс, Андреас; Druchkiv, Vasyl; Pose, Lumi; Linke, Stephan J.; Steinberg, Johannes; Katz, Toam

doi:10.1016/j.jcrs.2019.01.030

Cited by 12 publications

(9 citation statements)

References 12 publications

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“…Pentacam is used to measure the pupil offset and X and Y components in this study as Frings’ procedure, and accurate results of pupil offset can be obtained with this method. 18 , 19 Although there are various instruments for measuring pupil offset in clinical practice, a large number of clinical applications and studies have shown that these instruments can accurately measure pupil offset. 20 However, we should be careful when comparing results from various instruments due to the different principles of each instrument.…”

Section: Discussionmentioning

confidence: 99%

Characteristics of Pupil Offset in Young Asian Adults With Mild-Moderate and High Myopia

Sun

Liu

et al. 2022

Trans. Vis. Sci. Tech.

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Purpose The purpose of this study was to explore the characteristics of pupil offset in young Asian adults with myopia. Methods In total, 1200 eyes (600 young adults, 18–35 years old) were divided into mild-moderate and high groups according to equivalent spherical diopters (SEQ). The pupil offset and its X and Y components were compared between the groups. Linear correlation was analyzed among pupil offset, X and Y components, and SEQ. Multiple linear regression analysis was conducted for pupil offset and eye parameters. Results The mean age of all subjects was 22.5 ± 4.8 years. The mean magnitude of the pupil offset (0.18 ± 0.09 mm vs. 0.15 ± 0.08 mm) and Y component (0.12 ± 0.08 mm vs. 0.10 ± 0.07 mm) were larger in the high group than in the mild-moderate group ( P < 0.05). The magnitude of pupil offset, X and Y components, and SEQ were positively correlated. The pupil center (PC) of the right eye in the mild-moderate group was mainly superotemporal to the corneal vertex and mainly superonasal for the left eye and both eyes in the high group. Multiple linear regression analysis revealed that the magnitude of pupil offset correlated with central corneal thickness, intraocular pressure, and mean corneal curvature ( P < 0.05). Conclusions The magnitude of the pupil offset that correlated with partial eye parameters and its X and Y components increased as the SEQ increased, and the PC gradually shifted toward the superonasal direction in young Asian adults with myopia. Translational Relevance Subjects with high myopia with a larger pupil offset should be considered for better postoperative visual quality during refractive surgery.

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Section: Discussionmentioning

confidence: 99%

Characteristics of Pupil Offset in Young Asian Adults With Mild-Moderate and High Myopia

Sun

Liu

et al. 2022

Trans. Vis. Sci. Tech.

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“…Longitudinal changes in chord mu, chord alpha, or APD could be future lines of research after other surgeries. Descemet stripping-automated endothelial keratoplasty (DSAEK), intracorneal ring segments (ICRS) or laser assisted in situ keratomileusis (LASIK) [ 30 ] could be possible candidates for MIOLs. Alpha and kappa angles or chords are of importance, besides in the preoperative study of the MIOL [ 10 , 31 ].…”

Section: Discussionmentioning

confidence: 99%

Chord Mu (µ) and Chord Alpha (α) Length Changes in Fuchs Endothelial Corneal Dystrophy before and after Descemet Membrane Endothelial Keratoplasty (DMEK) Surgery

Rocha‐de‐Lossada

Sánchez‐González

Borroni

et al. 2021

JCM

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This paper will evaluate chord mu and alpha length in patients with Fuchs endothelial corneal dystrophy (FECD) and its changes following Descemet membrane endothelial keratoplasty (DMEK). Patients with FECD that underwent DMEK surgery were included in this retrospective study. Scheimpflug Tomography was carried out in order to calculate chord mu and chord alpha lengths prior to surgery and at 3 and 12 months postoperative. This study included 27 eyes from 27 patients. Significant changes in chord mu were observed within the first three months (from 0.47 ± 0.32 to 0.29 ± 0.21 mm, p < 0.01) and remained stable 12 months postoperative (0.30 ± 0.21 mm, p > 0.05). However, chord alpha remained stable throughout the 12 months post surgery (from 0.53 ± 0.19 to 0.49 ± 0.14 mm, p > 0.05). In addition to the pupillary center distance from the corneal apex (from 0.35 ± 0.25 to 0.34 ± 0.20 mm, p > 0.05) also remain stable. In FECD patients undergoing DMEK surgery, chord mu length decreased, and chord alpha length remained stable after 12 months of follow-up.

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“…LASIK is a highly successful surgical treatment for correcting myopia and low levels of hyperopia. However, treatment of astigmatism, especially hyperopic astigmatism, is still a therapeutic challenge and often results in significant refractive misscorrections (2,12). Methods to calculate differences between, and changes of, astigmatic powers and axes have been previously developed (13,14).…”

Section: Discussionmentioning

confidence: 99%

Treatment of High Astigmatism with WaveLight Allegretto Eye-Q Excimer Laser Platform

Biščević¹,

Bohač²,

Pjano³

et al. 2019

Acta Inform Med

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Introduction:The WaveLight Allegretto Eye-Q is a flying-spot excimer laser, with a pulse repetition rate of 400Hz, with two galvanometric scanners for positioning laser pulses. The system has an infrared high speed camera operating at 400Hz to track the patient’s eye movements that either compensates for changes in eye position or interrupts the treatment if the eye moves outside a preset predetermined range.Aim:The purpose of this study was to investigate WaveLight Allegretto Eye-Q 400Hz laser delivery platform aimed to correct astigmatism by subjecting the pre and postoperative astigmatic values to vector analysis.Methods:Patients were divided into two groups, depending on the type of astigmatism. Astigmatism was between 2 and 7 diopters (D). A total of 188 eyes (110 patients), 127 eyes (71 patients) with myopic astigmatism and 61 eyes (39 patients) with mixed astigmatism underwent unremarkable LASIK correction on WaveLight Allegretto Eye-Q 400Hz. 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 that J0 significantly reduced after LASIK (p<0.001) but not J45. There was no significant association between individual pairs of pre and postoperative J0 &J45 values.Conclusion:WaveLight Allegretto 400Hz showed excellent results for treating patients with high 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 postoperatively between groups treated on WaveLight Allegretto platform according to the vector analyses.

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Analysis of excimer laser treatment outcomes and corresponding angle κ in hyperopic astigmatism

Cited by 12 publications

References 12 publications

Characteristics of Pupil Offset in Young Asian Adults With Mild-Moderate and High Myopia

Characteristics of Pupil Offset in Young Asian Adults With Mild-Moderate and High Myopia

Chord Mu (µ) and Chord Alpha (α) Length Changes in Fuchs Endothelial Corneal Dystrophy before and after Descemet Membrane Endothelial Keratoplasty (DMEK) Surgery

Treatment of High Astigmatism with WaveLight Allegretto Eye-Q Excimer Laser Platform

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