Influence of angle kappa and angle alpha on visual quality after implantation of multifocal intraocular lenses

2019 ◽  
Vol 45 (9) ◽  
pp. 1258-1264 ◽  
Author(s):  
Yana Fu ◽  
Jiaojiao Kou ◽  
Dongjie Chen ◽  
Dandan Wang ◽  
Yinyin Zhao ◽  
...  
Keyword(s):  
Visual Quality ◽  
Intraocular Lenses ◽  
Multifocal Intraocular Lenses ◽  
Angle Alpha ◽  
Angle Kappa

scholarly journals Method to quantify the decentration of the multifocal intraocular lenses in relation to the visual axis

2018 ◽  
Vol 17 (4) ◽  
pp. 117-119
Author(s):  
Fernando Eduardo Polit
Keyword(s):  
Intraocular Lens ◽  
Qualitative Method ◽  
Visual Quality ◽  
Intraocular Lenses ◽  
Slit Lamp ◽  
Visual Axis ◽  
Light Reflex ◽  
Multifocal Intraocular Lenses ◽  
Real Value ◽  
Slit Lamp Biomicroscopy

Since position and centration have shown to affect the effectiveness of multifocal intraocular lenses (MFIOLs), some authors have proposed using the "coaxially sighted IOL light reflex" as a landmark to allow consistent centration of MFIOLs. Postoperatively, assessing the location of the intraocular lens with respect to the visual axis is also important. Centration of the MFIOLs can be identified postoperatively by slit lamp biomicroscopy, but it is still a qualitative method. The Nidek OPD Scan III is used. The instrument obtains retro illumination images, which allows the observation of the diffractive rings of the multifocal intraocular lenses implanted following phacoemulsification. The retro illumination image describes the location of the visual axis (white cross with blue borders +), the center of the photopic (pink cross) and mesopic (turquoise cross) pupil, quantifies the distance between the center of the pupil and the visual axis, and places the visual axis in degrees. It is attempted to match the rings of the lens with that of the acetate grid. Once the best possible equidistance between the lens and grid rings has been achieved. This method can be useful to be able to have reference of a real value of decentration of the lenses and thus have a surgical plan and try to center the lenses. We are also creating a technique to properly center the lenses, in addition to performing an analysis of the results in terms of postoperative visual quality in relation to the lens's decentration and thus see how this really affects.

scholarly journals Influence of Angle Alpha on Visual Quality after Implantation of Extended Depth of Focus Intraocular Lenses

2021 ◽  
Author(s):  
Miaomiao Qin ◽  
Min Ji ◽  
Tianqiu Zhou ◽  
Yurong Yuan ◽  
Jiawei Luo ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Spherical Aberration ◽  
Visual Quality ◽  
Intraocular Lenses ◽  
Patient Questionnaire ◽  
Modulation Transfer ◽  
Depth Of Focus ◽  
Extended Depth Of Focus ◽  
Postoperative Changes ◽  
Angle Alpha

Abstract Background: To assess postoperative changes in angle alpha, and to evaluate the postoperative visual quality of patients with different angle alpha values after implantation of extended depth of focus (EDOF) intraocular lenses (IOLs).Methods: Seventy-nine eyes of 79 patients who had phacoemulsification with EDOF IOLs implantation were enrolled. A cut-off value of 0.3 mm, 0.4 mm, and 0.5 mm in preoperative angle alpha was chosen to divide eyes into groups. Distance, intermediate, and near visual acuities, modulation transfer function (MTF), and aberrations were recorded during a 6-month follow-up. A patient questionnaire was completed. Results: There were no significant differences in angle alpha postoperatively compared to preoperatively. No significant differences were found in visual acuity and MTF between all groups. With 5mm pupil diameter, there were significant differences of higher-order aberrations and spherical aberration in ocular aberration and internal aberration between angle alpha＜0.4 mm and angle alpha≥ 0.4 mm. Additionally, significant differences of coma were also added in cut-off value of 0.5 mm. When the value of angle alpha is 0.4 mm or higher, there were significant differences in the score of halos and glare.Conclusions: Angle alpha did not affect visual acuity, but the value of 0.4 mm or higher in angle alpha affected the visual quality under scotopic conditions and occurrence of halos and glare. For patients with 0.4 mm or higher in angle alpha, the decision to implant a EDOF IOL should be carefully considered.

scholarly journals Visual quality and performance comparison between 2 refractive rotationally asymmetric multifocal intraocular lenses

2017 ◽  
Vol 43 (8) ◽  
pp. 1020-1026 ◽  
Author(s):  
Richard N. McNeely ◽  
Eric Pazo ◽  
Andrew Spence ◽  
Olivier Richoz ◽  
Andrew M. Nesbit ◽  
...  
Keyword(s):  
Visual Quality ◽  
Performance Comparison ◽  
Intraocular Lenses ◽  
Multifocal Intraocular Lenses ◽  
And Performance

Role of angle kappa in patient dissatisfaction with refractive-design multifocal intraocular lenses

2011 ◽  
Vol 37 (9) ◽  
pp. 1739-1740 ◽  
Author(s):  
Gaurav Prakash ◽  
Amar Agarwal ◽  
Dimple Rohit Prakash ◽  
Dhivya Ashok Kumar ◽  
Athiya Agarwal ◽  
...  
Keyword(s):  
Intraocular Lenses ◽  
Patient Dissatisfaction ◽  
Multifocal Intraocular Lenses ◽  
Angle Kappa

scholarly journals Long-Term Clinical Outcomes after Mix and Match Implantation of Two Multifocal Intraocular Lenses with Different Adds

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Yuanfeng Jiang ◽  
Shaochong Bu ◽  
Fang Tian ◽  
Jingli Liang ◽  
Tiecheng Wang ◽  
...  
Keyword(s):  
Clinical Outcomes ◽  
Visual Quality ◽  
Intraocular Lenses ◽  
High Rate ◽  
Bilateral Group ◽  
Multifocal Intraocular Lenses ◽  
Quality Of Vision ◽  
Visual Phenomena ◽  
Mix And Match

Purpose. To compare long-term clinical outcomes between patients with bilateral implantation of +3.0 diopter (D) multifocal intraocular lenses (IOLs) and mix and match implantation of +2.5 D and +3.0 D multifocal IOLs. Material and Methods. This retrospective observer-masked cohort study comprised 66 eyes of 33 patients with two different strategies of binocular multifocal IOLs implantation: bilateral +3.0 D (17 patients) (bilateral group) and mix and match +2.5 D and +3.0 D (16 patients) (blended group). Patients were recruited 1 year (±3 months) after second-eye surgery. The primary effectiveness endpoint was binocular uncorrected intermediate visual acuity (UCIVA) at 70 cm. The secondary assessments included binocular visual quality tests and quality-of-vision questionnaire. Results. The blended group showed clinically better UCIVA (0.10 ± 0.07 logMAR) at 70 cm than the bilateral group (0.26 ± 0.09 logMAR) with a difference of 0.16 ± 0.08 logMAR (P<0.001). Similar binocular visual acuities were achieved between the two groups at the near and far distance. The binocular defocus curves showed better performance in the blended group from 50 cm to 1 m. The mean binocular contrast sensitivities under the photopic conditions with or without glare and mesopic condition without glare were clinically better in the blended group. Both the groups reported low rate of visual phenomena, high rate of spectacle independence, and satisfaction. Conclusions. Comparing with bilateral implantation of +3.0 D multifocal IOLs during the cataract surgery, mix and match implantation of +2.5 D and +3.0 D multifocal IOLs provides a wider depth of binocular focus, especially for intermediate distances, and better binocular visual quality.

scholarly journals Influence of angle Kappa on the optimal intraocular orientation of asymmetric multifocal intraocular lenses

2021 ◽  
Vol 14 (1) ◽  
pp. 78-85
Author(s):  
Sergio Bonaque-González ◽  
Matt T. Jaskulski ◽  
David Carmona-Ballester ◽  
Alicia Pareja-Ríos ◽  
Juan M. Trujillo-Sevilla
Keyword(s):  
Intraocular Lenses ◽  
Multifocal Intraocular Lenses ◽  
Angle Kappa

scholarly journals The Distribution of IOL Center and Its Relationship with Internal Ocular Objective Visual Quality in Cataract Patients

2021 ◽  
Author(s):  
Tan Long ◽  
Xin Gu ◽  
Wei Wei ◽  
Ting Ma ◽  
Rui Wang
Keyword(s):  
Cross Section ◽  
Visual Quality ◽  
Optic Axis ◽  
Strehl Ratio ◽  
Visual Axis ◽  
Ocular Aberrations ◽  
Angle Alpha ◽  
Angle Kappa ◽  
Pearson Correlations ◽  
Cataract Patients

Abstract Background: To investigate the distribution of the center of the intraocular lens (IOL) after phacoemulsification, and to assess the correlation between the center of IOL and preoperative angle kappa, angle alpha, and objective internal visual quality, respectively, in cataract patients with monofocal and bifocal IOLs implantation. Methods: Prospective cross-section cases series. One hundred and thirty-seven eyes of 107 patients who underwent phacoemulsification were included. Preoperative angle kappa and alpha, postoperative internal ocular aberrations, internal objective visual quality, and the center of IOL relative to the visual axis (CIV) was evaluated using iTrace system. Independent sample t-tests and Pearson correlations were performed.Results: Locations of CIV were scattered in all directions centered on corneal light reflection for both C-Loop designed IOL and plate-haptic designed IOL. No correlations were found between CIV and preoperative angle kappa and alpha in both magnitude and orientation. No correlations were found between CIV and postoperative internal ocular aberrations (astigmatism, coma, and trefoil). In the bifocal IOLs group, the CIV was negatively correlated to the internal Strehl ratio at 3mm; however, it was not correlated to the Strehl ratio at 5mm. The magnitude of CIV was positively correlated to the length of the optic axis.Conclusions: CIV was not predictable according to angle kappa and alpha before cataract surgery. CIV was not related to internal ocular aberration, but large CIV may lead to light scattering due to steps between diffractive rings in patients with small pupil sizes. The magnitude of CIV may be greater in cataract patients with longer optic axis.Trial registration: retrospectively registered.

Sign in / Sign up

Export Citation Format

Share Document