Surgical approach affects intraocular lens decentration

Chang, Pei Yao; Lian, Chi Yang; Wang, Jia Kang; Su, Pei–Yuan; Wang, Jiun Yi; Chang, Shang‐Tzen

doi:10.1016/j.jfma.2016.04.003

Cited by 11 publications

(3 citation statements)

References 22 publications

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“…Nonetheless, the minimal tilt and decentration values reported in this study with the pupillary axis as reference point are in line with the values described in the literature. 26 Furthermore, similar to Baumeister et al, we found that IOL tilt and decentration were stable over time 29 suggesting a good capsular bag stability of the Aspira-aXA likely due to its unique design. We also did not notice differences in tilt and decentration values between eyes with different axial lengths.…”

Section: Discussionsupporting

confidence: 83%

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Rotational Stability, Tilt and Decentration of a New IOL with a 7.0 mm Optic

Wendelstein

Laubichler

Fischinger

et al. 2021

Current Eye Research

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Purpose: To evaluate rotational stability, tilt and decentration of a new monofocal IOL with a 7.0 mm optic and frame haptics. Methods: Prospective post-market clinical follow-up study at the Kepler University Hospital Linz, Austria. An Aspira-aXA (HumanOptics, Germany) was implanted in 74 eyes of 42 cataract patients. The lens was manufactured with toric markings. IOL rotational stability was evaluated by comparing its position at the end of surgery (EoS) versus 1 day, 1 week, 1 month and 4 months postoperatively. IOL tilt and decentration were measured using a Scheimpflug camera at 1 week, 1 month and 4 months. Results: Median absolute IOL rotation was 1.42 degrees (n = 52; mean = 2.18 ± 2.23°) within 1 day after surgery and was significantly higher compared to all later intervals (median <1.0 degree; P = .001). At the 4 months follow-up, IOL rotation was within 5.0 degrees in 85% of the eyes (n = 40) and within 10.0 degrees in 98% (n = 46) of the eyes. The only eye with an IOL rotation of ≥ 10.ty0 degrees (EoS vs. 1 day) had an AL of 26.45 mm. At the last follow-up, the IOL vertical and horizontal tilt referenced to the pupillary axis was in average less than 1.5 degrees in both eyes (n = 54; maximum 5.85°). Decentration in both meridians was on average less than 0.10 mm in both eyes (maximum 0.30 mm). Conclusion:The one-piece Aspira-aXA IOL showed good and stable positioning within the capsular bag over a 4 months period.

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Section: Discussionsupporting

confidence: 83%

“…Despite these difficulties in data comparison, it has been shown that decentration up to 0.40 mm and tilt up to 7.0 degrees do not influence visual performance. 26,27 According to modern schematic model eyes (e.g. the Liou-Brennan eye) the crystalline lens is tilted and decentered.…”

Section: Discussionmentioning

confidence: 99%

Rotational Stability, Tilt and Decentration of a New IOL with a 7.0 mm Optic

Wendelstein

Laubichler

Fischinger

et al. 2021

Current Eye Research

View full text Add to dashboard Cite

show abstract

“…Some studies reported an appearance of astigmatism and Higher Order Aberrations (HOAs) such as coma with IOL misalignment [4] and tilt [25,26]. IOL stability inside the eye is influenced by many factors such as the capsular bag diameter related to the IOL overall diameter [27], the haptic design and lens material [7], the surgical technique [28], and even some postoperative actions like the Nd:YAG laser application for posterior capsulotomy [29].…”

Section: Plos Onementioning

confidence: 99%

Misalignment and tilt effect on aspheric intraocular lens designs after a corneal refractive surgery

et al. 2020

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Purpose To numerically evaluate and compare the tolerance to misalignment and tilt of aspheric intraocular lenses (IOLs) designed for three eyes: with standard cornea and with simulated corneas after myopic and hyperopic laser ablation surgery. Methods Three aspheric IOLs of +20.00 diopter (D) with different spherical aberration (SA) (Z40) values have been designed using a theoretical model eye. Drastic changes on the theoretical eye anterior corneal asphericity have been performed to simulate myopic and hyperopic refractive surgeries. The effect of IOL misalignment and tilt on the image quality has been evaluated using a commercial optical software design for the three eye models. Image quality was assessed from the modulation transfer function (MTF), root mean square (RMS) values of defocus, astigmatism, coma and spherical aberration (Z40), and retinal images obtained from a visual simulator using an aleatory optotype of 0.00 LogMar visual acuity (VA). Results IOL misalignment and tilt reduced MTF values in general, and increased wavefront aberrations errors. Aberration-free IOLs maintained best the MTF values when misalignments were applied, together with good on-axis optical quality. IOLs with negative SA (Z40) correction decreased the MTF value under 0.43 for misalignments values higher than 0.50 mm with the three corneas. The effect of misalignment on RMS astigmatism and coma was correlated with the IOL SA (Z40) and with the three corneas. Conclusions This theoretical study shows that the largest degradation in image quality arises for the IOL with the highest amount of spherical aberration (Z40). Moreover, it has been found that the aspherical design has a more influential role in misalignment tolerance than in tilt tolerance.

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