Correcting Interdevice Bias of Horizontal White-to-White and Sulcus-to-Sulcus Measures Used for Implantable Collamer Lens Sizing

Guber, Ivo; Bergin, Ciara; Perritaz, Sylvie; Majo, F.

doi:10.1016/j.ajo.2015.09.037

Cited by 31 publications

(17 citation statements)

References 40 publications

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“…Regarding WTW measurements, the Pentacam shows a marginal overestimation of 0.1 mm compared to the standard WTW for ICL sizing (using Orbscan). 19 Anterior segment optical coherence tomography (AS-OCT) (Visante, Zeiss Meditec AG, Jena, Germany) was used for measuring the horizontal anterior angle distance (ATA), crystalline lens rise (CLR) and ACD. The AS-OCT Visante scans have a transverse and axial resolution of 20 and 60 µm, respectively.…”

Section: Methodsmentioning

confidence: 99%

<p>Inter-Eye Vault Differences of Implantable Collamer Lens Measured Using Anterior Segment Optical Coherence Tomography</p>

Manito¹,

Trancón²,

Sierra³

et al. 2020

OPTH

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Purpose The distance between an implantable collamer lens (ICL) and the crystalline lens, namely vault, is a space regulated by the interaction of the ICL and the anatomical structures of the eye. This study analysed the differences in vault size between fellow eyes with similar anterior segment biometry. Patients and Methods A retrospective case series analysed 109 cases of patients bilaterally implanted with EVO-V4c. Patients were analysed pre- and postoperatively using anterior segment optical coherence tomography. The range of vault inter-eye differences was defined as the 95% confidence interval of the differences. Bivariate correlation was applied to seek for associations between vault inter-eye differences with biometric and lens parameters (angle-to-angle, anterior chamber depth, crystalline lens rise, central corneal thickness, central keratometry, ICL spherical equivalent, horizontal compression, postoperative pupil diameter and vault). Results Mean vault inter-eye differences were similar between fellow eyes (26.0 ± 122.5 µm). The 95% confidence interval range of the differences was ±240.1 µm, nearly 50% of the cases presented vault inter-eye differences higher than 100 µm. The vault of the first operated eye explained 81% of the variance in the second eye vault. Vault inter-eye differences were positively correlated with the level of horizontal compression and with vault magnitude. Conclusion Vaults measured in fellow eyes may present considerable differences, which can reach 25% of the common vault range. This reflects some degree of baseline variability in the vault. Clinically, these differences assume special relevance in cases where low or high vaults are expected.

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Section: Methodsmentioning

confidence: 99%

<p>Inter-Eye Vault Differences of Implantable Collamer Lens Measured Using Anterior Segment Optical Coherence Tomography</p>

Manito¹,

Trancón²,

Sierra³

et al. 2020

OPTH

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“…Reinstein et al 30 reported within-eye repeatability of 0.23 mm and population standard deviation of 0.69 mm for sulcus diameter. Guber et al 31 utilized the HiScan 35 MHz UBM and found that measures were less repeatable than expected, with a within-subject standard deviation for repeated measures with the same observer (Sr) of 0.39 mm between any two images and a 95% confidence interval (CI) of ±0.76. The Sr improved to 0.15 mm when the average of two measures was used.…”

Section: Biometrymentioning

confidence: 99%

Meta-analysis and review: effectiveness, safety, and central port design of the intraocular collamer lens

Packer¹

2016

OPTH

219

198

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The purpose of this review is to summarize relevant data from publications appearing in the peer-reviewed scientific literature over the past decade since US Food and Drug Administration approval of the implantable collamer lens (ICL), and, in particular, to review studies relating to sizing methodology, safety, and effectiveness, as well as more recent studies reporting clinical outcomes of the V4c Visian ICL with KS Aquaport, VICMO. A literature search was conducted using two databases, PubMed.gov and Science.gov, to identify all articles published after 2005 related to the Visian ICL (STAAR Surgical, Inc.). Articles were examined for their relevance to sizing methodology, clinical safety, and effectiveness, and the references cited in each article were also searched for additional relevant publications. The literature review revealed that all currently reported methods of determining the best-fit size of the ICL achieve similarly satisfactory results in terms of vault, the safe distance between the crystalline lens and the ICL. Specifically, meta-analysis demonstrated that sulcus-to-sulcus and white-to-white measurement-based sizing methods do not result in clinically meaningful nor statistically significant differences in vault (two-sample two-sided t-test using pooled mean and standard deviations; t (2,594)=1.33; P=0.18). The reported rates of complications related to vault are very low, except in two case series where additional risk factors such as higher levels of myopia and older age impacted the incidence of cataract. On the basis of preclinical studies and initial clinical reports, with up to 5 years of follow-up, the new VICMO central port design holds promise for further reduction of complications. Given its safety record and the significant improvement in vision and quality of life that the ICL makes possible, the benefits of ICL implantation outweigh the risks.

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“…Because four haptics of the ICL need to be placed in the ciliary sulcus, the accurate measurement of sulcus-to-sulcus (STS) diameter has an important effect on the choice of the ICL size [ 12 ]. However, the repeatability of STS measurement is poor, and patients are not comfortable during the examination, whereas WTW measurement is easy and has good repeatability [ 13 ]. Therefore, increasing the value of the horizontal corneal diameter by 0.5–1.0 mm based on the anterior chamber depth (ACD) is traditionally used to estimate the diameter of the ciliary sulcus [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Difference Between the White-to-White and Sulcus-to-Sulcus on Vault and the Related Factors After ICL Implantation

et al. 2021

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Introduction: To assess the differences between the horizontal white-to-white (WTW) and horizontal sulcus-to-sulcus (STS) diameter measurements, their related factors, and their effects on vault after implantable Collamer lens ( ICL) implantation. Methods: This retrospective study included 429 eyes of 429 patients (145 men and 284 women with a mean age of 29.22 ± 8.06 years) who underwent ICL implantation. The choice of the ICL size depended on the WTW diameter and anterior chamber depth (ACD). The information of WTW diameter, STS diameters, ACD, and their relationships on vault were analyzed. Results: Horizontal STS and WTW diameters were correlated (r = 0.71, P \ 0.001). The mean difference between the STS and WTW diameters was -0.02 ± 0.33 (-1.36 to 1.11) mm. The average vaults of the 4 STS-WTW \ -0.1 group, -0.1 B 4 STS-WTW B 0.1 group, and

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Correcting Interdevice Bias of Horizontal White-to-White and Sulcus-to-Sulcus Measures Used for Implantable Collamer Lens Sizing

Cited by 31 publications

References 40 publications

<p>Inter-Eye Vault Differences of Implantable Collamer Lens Measured Using Anterior Segment Optical Coherence Tomography</p>

<p>Inter-Eye Vault Differences of Implantable Collamer Lens Measured Using Anterior Segment Optical Coherence Tomography</p>

Meta-analysis and review: effectiveness, safety, and central port design of the intraocular collamer lens

Effect of the Difference Between the White-to-White and Sulcus-to-Sulcus on Vault and the Related Factors After ICL Implantation

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