Implantable collamer lens sizing based on measurement of the sulcus-to-sulcus distance in ultrasound biomicroscopy video clips and ZZ ICL formula

Zhang, Jun; Shao, Jie; Li, Zheng; Zhao, Xianxian; Chen, Shu

doi:10.1186/s12886-022-02583-9

Cited by 6 publications

(13 citation statements)

References 31 publications

(35 reference statements)

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“…Personalized ICL size selection considers the anterior chamber structure, including the accurate measurement of LT. Additionally, LT is an essential parameter for predicting post-ICL vault height. [25,26] The WTW measured using the Colombo IOL was signi cantly in agreement (ICC:0.729, p < 0.0001) with IOL master 700 but with larger readings (β = -0.244, p < 0.0001). An average deviation of -0.244 mm for WTW (with a 95% LOA from − 0.603 mm to 0.114 mm, p < 0.0001) was also observed from the Bland-Altman plots.…”

Section: Discussionmentioning

confidence: 95%

Comparison of anterior segment parameters of patients with myopia measured using 2 swept-source optical coherent biometry devices

Sun,

Ye,

Zhao

et al. 2024

Preprint

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Background This study assessed the agreement of anterior segment parameters of patients with myopia measured using 2 swept-source optical coherent biometry devices: the Colombo intraocular lens (IOL) and IOL Master 700. Methods Eighty patients (male/female, 22/58; average age, 29.11 ± 7.77 years) with myopia (159 eyes) were included in this study in May 2023. All participants underwent measurements using the IOL Master 700 and Colombo IOL to obtain axial length (AXL), central corneal thickness (CCT), lens thickness (LT), white-to-white (WTW), and front flat (K1) and steep (K2) corneal keratometry. The measurements by the 2 devices were compared using the generalized estimating equation, correlation analysis, and Bland-Altman plots. Results The Colombo IOL measured larger values for WTW (OR = 1.277, p < 0.0001) and lower values for K2 (OR = 0.587, p < 0.033). All anterior segment measurements by both instruments showed positive correlations (0.8079 < r < 0.9996, p < 0.01), with AXL demonstrating the strongest correlation (r = 0.9996, p < 0.0001). The intraclass correlation coefficients for AXLs measured by both instruments was 0.999 (p < 0.0001), and Bland-Altman plot indicated that the 95% limits of agreement ranged from − 0.078 to 0.11. The measurement deviations of K2, LT, WTW between IOL Master 700 and Colombo IOL were 0.526 D, -0.085 mm and − 0.244 mm, respectively. Conclusions The Colombo IOL and IOL Master 700 comparably measured CCT and AXL. However, their measurements of corneal refractive power, WTW and LT were significantly different, necessitating caution in using two devices interchangeably in clinical practice.

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Section: Discussionmentioning

confidence: 95%

Comparison of anterior segment parameters of patients with myopia measured using 2 swept-source optical coherent biometry devices

Sun,

Ye,

Zhao

et al. 2024

Preprint

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“…It incorporates the Zhang and Zheng (ZZ) ICL formula and relies on LT, vertical STS, and horizontal STS to predict vault and calculate IOL size. 24 …”

Section: Planning Methodsmentioning

confidence: 99%

Implantable Collamer Lens Procedure Planning: A Review of Global Approaches

Thompson,

Cummings,

Wang

2024

OPTH

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More than 2 million implantable collamer lenses (ICLs) have been implanted worldwide. With a central port to improve aqueous flow through the ICL, the latest iteration of this phakic intraocular lens (pIOL) has been shown to have stable outcomes with very low rates of adverse events. However, correct planning and ICL size selection continue to be important to achieve an optimal vault. Shallow or excessive vaults are not complications in and of themselves but may increase the risk of complications. Historically, surgeons have relied on measurements of anterior chamber depth (ACD) and manual, caliper-measured white-to-white (WTW) distance to select the ICL size. New diagnostic and imaging technologies such as optical coherence tomography (OCT) and ultrasound biomicroscopy (UBM) provide additional opportunities for visualization and measurement of the intraocular dimensions involved in phakic intraocular lens implantation, including sulcus-to-sulcus (STS) and angle-to-angle (ATA) diameters. This paper reviews various approaches to ICL planning and sizing that have been published in the peer-reviewed literature, all of which produce acceptable results for predicting vault and size selection. Surgeons may also want to identify a methodology for patient evaluation and ICL size selection that best aligns with their personal preferences, diagnostic technology, and familiarity with analytical optimization tools.

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“… The KS formula is based on ICL size and ATA for the prediction of vault; the predicted vault values were automatically obtained from CASIA2 AS-OCT [ 12 ]. The ZZ formula, based on HSTS, VSTS, and LT for the prediction of vault; predicted vault values were obtained by utilizing data from the website ( http://www.zzcal.com ) [ 15 ]. The WH formula is based on the ICL size, ATA, CLR, and CSA for vault prediction.…”

Section: Methodsmentioning

confidence: 99%

Comparison of the Accuracy of Seven Vault Prediction Formulae for Implantable Collamer Lens Implantation

Wu,

Luo,

Chen

et al. 2023

Ophthalmol Ther

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Introduction This study aimed to compare the accuracy of seven implantable collamer lens (ICL) implantation vault prediction formulae. Methods We retrospectively analyzed 328 patients (328 eyes) who underwent ICL implantation and the prediction accuracy of seven formulae: NK, KS, WH, Luo, Zhu, Hun, and ZZ were compared. Moreover, the accuracy of the seven formulae for different ICL sizes was compared. The formulae were tested using mean absolute prediction error (MAE), median absolute prediction error (MedAE), prediction error (PE) percentages at ± 50 µm, ± 100 µm, ± 200 µm, and ± 300 µm, and Bland-Altman analysis. Results The PE of the seven formulae were statistically significant ( P < 0.001). The KS (101.00 µm) and WH formulae (116.65 µm) had the smallest MedAE, followed by the Luo (123.62 µm), NK (141.50 µm), Hun (152.68 µm), ZZ (196.00 µm) and Zhu formula (225.98 µm). The highest percentage of PE in the range of ± 300µm was 94.3% and 93% for the KS and WH formulae, respectively. Among the different ICL size groupings, the KS formula predicted the smallest MedAE for 12.1 mm and 12.6 mm, whereas the Luo and WH formulae predicted the smallest MedAE for 13.2 mm and 13.7 mm, respectively. Conclusions The KS and WH formulae provided better outcomes by predicting the vault with higher accuracy than of the NK, Hun, Luo, ZZ, and Zhu formulae. Trial Registration ChiCTR2200065501.

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Implantable collamer lens sizing based on measurement of the sulcus-to-sulcus distance in ultrasound biomicroscopy video clips and ZZ ICL formula

Cited by 6 publications

References 31 publications

Comparison of anterior segment parameters of patients with myopia measured using 2 swept-source optical coherent biometry devices

Comparison of anterior segment parameters of patients with myopia measured using 2 swept-source optical coherent biometry devices

Implantable Collamer Lens Procedure Planning: A Review of Global Approaches

Comparison of the Accuracy of Seven Vault Prediction Formulae for Implantable Collamer Lens Implantation

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