Clinical evaluation of toric intraocular lens implantation based on iTrace wavefront keratometric astigmatism

Zhang, Zhe; Li, Hui; Zhou, Jing; Zhang, Yaqin; Zhang, Suhua

doi:10.1186/s12886-020-01726-0

Cited by 5 publications

(5 citation statements)

References 23 publications

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“…Mean absolute lens rotation was less than 1° at both the 1-day and 1-week visits, which was less than previously reported for the TECNIS Toric IOL (1° to 8.38°), 4,9,10,12,[17][18][19] confirming that the squared and frosted haptic design improved rotational stability. These data compared favorably with absolute rotation reported for other toric IOL models, including with the AcrySof Toric IOL (Alcon Laboratories, Inc., Fort Worth, TX, USA) (1.5° to 8.0°), 5,9,18,[20][21][22][23][24] the enVista Toric IOL (Bausch+Lomb, Inc. Rochester, NY, USA) (1.11° to 3.85°), 25,26 and the HOYA XY-1 (HOYA, Tokyo, Japan) (5.43°). 18 The squared and frosted haptic design of the TECNIS Toric II IOL reduces IOL rotation by increasing the static friction between the frosted haptic arms and the capsular bag.…”

Section: Discussionsupporting

confidence: 64%

“…In comparison to the rotation data presented for the TECNIS Toric II IOL, Zhang et al reported that 31.7% and 5% of subjects implanted with the AcrySof Toric IOL showed >5° and >10° axis misalignment, respectively, at 1 week after surgery. 22 For both the TECNIS Toric II IOL and the Prototype 2 non-toric monofocal IOL, analysis of the mean signed lens orientation showed a small negative change in orientation over time, indicating a clockwise drift (−0.07° with TECNIS Toric II IOL and −0.23° with Prototype 2 non-toric monofocal IOL at the 1-week visit). These findings were opposite to previous reports of counterclockwise rotation 8,9,28 but consistent with two studies reporting clockwise rotation.…”

Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%

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Reproducibility of the Magnitude of Lens Rotation Following Implantation of a Toric Intraocular Lens with Modified Haptics

Quesada¹,

Quesada²,

Jones³

et al. 2022

OPTH

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Purpose To evaluate the reproducibility of magnitude of postoperative IOL rotation following implantation of a toric intraocular lens (IOL) with modified haptics, in comparison with a Proof-of-Concept (POC) study of prototype IOLs featuring the same haptic design. Patients and Methods A post-market, prospective, multicenter, single-arm, open-label clinical study was conducted. TECNIS Toric II IOL (Johnson & Johnson Vision, Irvine, CA, USA, Models ZCU150 to 600) were implanted in 125 subjects and evaluated at 1-day and 1-week postoperatively. An objective photographic method was used to determine postoperative IOL rotation. Uncorrected distance visual acuity (UCDVA), postoperative astigmatism, and surgeon satisfaction were also assessed. Rotation data were compared to the POC study in which two prototype non-toric monofocal IOLs, one with the same haptic design as Model ZCU, were studied. Results Mean absolute rotation was 0.82° ± 1.0° and 0.84° ± 0.92°at 1-day and 1-week visits, respectively. The percentage of eyes with ≤5° of absolute rotation was 98.9% and 99.5% at the 1-day and 1-week visits, respectively. The magnitude of rotation was similar to the POC study prototype IOLs. At 1-week, mean monocular UCDVA was 0.026 ± 0.135 (~20/21) logMAR and mean residual manifest refractive cylinder was 0.30 D ± 0.35 D. The mean signed axis difference (postoperative minus operative) of the TECNIS Toric II IOL was 0.23° ± 1.27° at 1-day and −0.07° ± 1.25° at 1-week, indicating a clockwise drift. At 1-week, surgeons were very satisfied or satisfied with overall clinical outcomes and rotational stability in 98% of implanted eyes. Conclusion The TECNIS Toric II IOL, with frosted, squared haptics, demonstrated low magnitude of postoperative IOL rotation, excellent uncorrected distance vision, and minimal residual astigmatism. The POC study design was supported, demonstrating that prototype non-toric monofocal IOLs can predict clinical performance of toric IOLs with the same haptic design.

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Section: Discussionsupporting

confidence: 64%

Section: Discussionmentioning

confidence: 93%

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Reproducibility of the Magnitude of Lens Rotation Following Implantation of a Toric Intraocular Lens with Modified Haptics

Quesada¹,

Quesada²,

Jones³

et al. 2022

OPTH

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“… 17 , 18 However, toric IOL alignment could also be determined, either subjectively by optical cut rotation 19 or by image capture and subsequent analysis in graphics editors, 20 , 21 or by the alternative use of aberrometry to separate corneal and lens-induced (respectively internal) astigmatism. 22 …”

Section: Discussionmentioning

confidence: 99%

Evaluation of Decentration, Tilt and Angular Orientation of Toric Intraocular Lens

Fus¹,

Pitrová²

2021

OPTH

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Purpose The aim of this study was to develop software for the universal objective evaluation of factors influencing intraocular correction of astigmatism, such as decentration, tilt, axial position and angular orientation the toric intraocular lens (IOL). Patients and Methods Software was developed using the MS Visual Studio environment. The analysis was presented using images of 67 eyes with an implanted IOLs of the SN6ATx model series. Decentration and angular position of the lens were obtained from images of the anterior segment of the eye, using a Visucam unit. Tilt was measured on tomographic images from OCT Avanti (in meridian of highest tilt and perpendicular meridian) and preoperative biometry parameters of eye (axial length, anterior chamber depth – ACD, ocular lens thickness – LT, limbus diameter and mean keratometry value) including postoperative anterior chamber depth (pACD) were measured using Lenstar LS900. Results Applying the software methodology to the evaluation of individual toric IOL parameters, the following results were obtained: mean decentration 0.25 ± 0.17 mm which was observed in 61.19% of eyes, mean misalignment to the planned axis equal to 3.8 ± 3.6 degrees, mean highest inclination equal to 3.7 ± 1.2 degrees and mean difference of pACD and ACD was equal to 1.46 ± 0.31 mm. There was only a weak nonsignificant correlation between preoperative ACD versus decentration and tilt of IOL or a weak significant correlation between preoperative LT and both decentration and misalignment of IOL. Conclusion The use of the presented methodology for determining the positional parameters of the toric IOL provided comparable results with the results of recent studies. Software design can be considered as a suitable alternative to previously published techniques, with the significant advantage of the possibility of using universal input images, their graphical editing and especially the possibility of comprehensive analysis of all parameters.

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“…We calculated TCRP for the central 4-mm zone of the pupil. The simK value was derived from the thin-lens formula and was calculated based on four points on a 3-mm circle centered on the corneal vertex 30 SimK evaluations use the anterior surface to represent the total corneal power without knowing posterior corneal information 31 ; this methodology uses the assumption that the anterior–posterior ratio is 0.822 and the corneal thickness is 500 μm 32 . Both TCRP via the Scheimpflug imaging system and simK via ray-tracing aberrometry can be used to calculate total corneal power.…”

Section: Methodsmentioning

confidence: 99%

Analysis of keratometric measurements in accordance with axial length in an aged population

Han

Ryu

Jung

et al. 2022

Sci Rep

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To investigate keratometric measurements according to axial length in an aged population. Patients requiring cataract surgery with keratometric measurements from four different ophthalmic devices (autorefractor/keratometer, Scheimpflug imaging, corneal topography/ray-tracing aberrometry, and partial coherence interferometry) between January 2016 and March 2021 were reviewed retrospectively. Cases for which four ophthalmic devices were deployed in the same order a day were included in this investigation. The corneal curvature of the flattest and steepest meridian, mean corneal curvature, corneal astigmatism, steepest axis location, and axial length were evaluated. In total, 250 eyes (137 patients) were included in the analysis. A negative correlation was found between mean corneal curvature and axial length, with correlation coefficients of 0.587, 0.592, 0.588, 0.591, 0.588, and 0.562 for autorefractor/keratometer, Scheimpflug imaging, corneal topography/ray-tracing aberrometry, partial coherence interferometry, total corneal refractive power of Scheimpflug imaging, and simulated keratometry of corneal topography/ray-tracing aberrometry measurements, respectively. No statistically significant differences were found for corneal astigmatism according to axial length. In axial length group of less than 26.0 mm, negative correlation was found between axial length and mean frontal corneal curvature while no correlation was found between axial length and corneal astigmatism. All four ophthalmic devices showed good inter-device reliability for mean corneal curvature but not corneal astigmatism.

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Clinical evaluation of toric intraocular lens implantation based on iTrace wavefront keratometric astigmatism

Cited by 5 publications

References 23 publications

Reproducibility of the Magnitude of Lens Rotation Following Implantation of a Toric Intraocular Lens with Modified Haptics

Reproducibility of the Magnitude of Lens Rotation Following Implantation of a Toric Intraocular Lens with Modified Haptics

Evaluation of Decentration, Tilt and Angular Orientation of Toric Intraocular Lens

Analysis of keratometric measurements in accordance with axial length in an aged population

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