Angle alpha as predictor for improving patient satisfaction with multifocal intraocular lenses?

Grzybowski, Andrzej; Eppig, Timo

doi:10.1007/s00417-020-05053-4

Cited by 16 publications

(12 citation statements)

References 18 publications

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“…In our research, the size of angle alpha was confirmed to be unchanged during cataract surgery in both photopic and mesopic light conditions (p = 0.5158 and p = 0.4775, respectively). Multiple studies ascertained that angle alpha might yield a significant estimation value for postoperative vision, and it might be a predictive factor of image quality by MIOL patients [3,7,9,45]. Our results support the former findings: The postoperative angle alpha was found to have a negative impact on near vision (UNVA; r = −0.315, R 2 = 0.113, p = 0.0543).…”

Section: Refractive Aberrations and Notable Angles (Kappa And Alpha)supporting

confidence: 87%

“…With the growth of people's demand for high living standards, the interest in achieving long-term visual comfort and spectacle independence has increased [1]. The rapid development in cataract and refractive surgery has brought the ever-growing popularity of multifocal IOLs (MIOLs), which successfully respond to these needs, providing functional vision at multiple distances [2,3]. Although spectacle-free vision after surgery has become achievable, postoperative visual outcomes do not always meet the preoperative expectations [2,4].…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Angle Alpha, Angle Kappa, and Optical Aberrations on Visual Outcomes after the Implantation of a High-Addition Trifocal IOL

Cervantes-Coste

Tapia

Corredor-Ortega

et al. 2022

JCM

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The aim of our investigation was to examine the possible correlations between optical aberrations, angle kappa, angle alpha, and visual outcomes following cataract surgery. In total, 56 eyes of 28 patients were implanted with the Liberty 677MY trifocal intraocular lens (IOL). Pre- and postoperative higher-order aberrations, coma, astigmatism, angle alpha, and angle kappa were registered, along with uncorrected and corrected visual acuities at multiple distances. Visual acuity and contrast sensitivity defocus curves were plotted, and the areas under the curve were calculated 1 and 3 months postoperatively. Excellent visual outcomes were found at all distances. Patients reported low levels of dysphotopsia, and 96.4% of patients achieved complete spectacle independence. While angle kappa significantly decreased during cataract surgery (p = 0.0007), angle alpha remained unchanged (p = 0.5158). Angle alpha correlated with postoperative HOAs and had a negative impact on near vision (p = 0.0543). Preoperative corneal HOA and coma had a strong adverse effect on future intermediate and near vision. Residual astigmatism significantly affected postoperative intermediate vision (p = 0.0091). Our results suggest that angle kappa is not an optimal predictive factor for future visual outcomes, while angle alpha and the preoperative screening of optical aberrations might help patient selection prior to multifocal IOL implantation.

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Section: Refractive Aberrations and Notable Angles (Kappa And Alpha)supporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

The Influence of Angle Alpha, Angle Kappa, and Optical Aberrations on Visual Outcomes after the Implantation of a High-Addition Trifocal IOL

Cervantes-Coste

Tapia

Corredor-Ortega

et al. 2022

JCM

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“…A certain tilt is common in clinical settings. Neither the crystalline lens nor the intraocular lens is aligned perfectly orthograde in relation to the line of sight 18 . This angle of tilt differs between individuals, but the mean tilt of the capsular bag in the human eye is slightly temporal.…”

Section: Discussionmentioning

confidence: 93%

Enhanced Depth-of-focus Intraocular Lenses: Latest Wavefront-shaped Optics versus Diffractive Optics

Schmid¹,

Luedtke²,

Borkenstein

2022

Optom Vis Sci

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The modulation transfer functions (MTFs) of two novel enhanced depth-of-focus (EDoF) intraocular lenses (IOLs) were compared with an established diffractive EDoF IOL. Such assessment, which was not described before in the literature, is of high clinical impact in lens surgery. PURPOSE:A new kind of nondiffractive, wavefront-shaped EDoF IOLs has been introduced very recently to cope with halos and glare known from diffractive optics. We aimed to assess the performance of two of these novel EDoF IOLs compared with an established diffractive EDoF IOL.METHODS: TECNIS Symfony, AcrySof IQ Vivity, and LuxSmart Crystal IOLs (22 D each) were assessed by the OptiSpheric IOL PRO 2 imaging test bench with an ISO-2 cornea and a wavelength of 546 nm. Measurements were carried out by TRIOPTICS GmbH. Through-frequency MTF, Strehl ratio, and U.S. Air Force targets were evaluated. A decentration of 1 mm and a tilt of 5°as well as different apertures of 3 and 4.5 mm were applied additionally.RESULTS: TECNIS Symfony performed superiorly to Vivity and LuxSmart for our settings. The diffractive optics of Symfony showed a considerable decrease in MTF and Strehl ratio when decentered. Overall, decentration had more impact on MTF and Strehl ratio than tilt. Larger aperture led to a decreased MTF and Strehl ratio for all IOLs tested. U.S. Air Force targets had better contrast for Symfony and for small aperture. CONCLUSION:The novel wavefront-shaped EDoF IOLs failed to outperform the established diffractive achromatic optics of Symfony EDoF IOL with respect to MTF and qualitative contrast function. These results apply only to the distance viewing condition. Near vision performance will be evaluated in a future study.

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“…Recently, the role of the alpha angle or chord alpha seems to take more importance. Unlike, chord mu, chord alpha could stay relatively stable after the procedure [ 17 , 35 , 36 ]. Therefore, according to us, more evidence is still necessary.…”

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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Angle alpha as predictor for improving patient satisfaction with multifocal intraocular lenses?

Cited by 16 publications

References 18 publications

The Influence of Angle Alpha, Angle Kappa, and Optical Aberrations on Visual Outcomes after the Implantation of a High-Addition Trifocal IOL

The Influence of Angle Alpha, Angle Kappa, and Optical Aberrations on Visual Outcomes after the Implantation of a High-Addition Trifocal IOL

Enhanced Depth-of-focus Intraocular Lenses: Latest Wavefront-shaped Optics versus Diffractive Optics

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

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