Comparison of anterior segment and lens biometric measurements in patients with cataract

Fukuda, Shin–ichi; Ueno, Yuta; Fujita, Akari; Mori, Hideki; Tasaki, Kuniharu; Murakami, Tomoya; Beheregaray, Simone; Oshika, Tetsuro

doi:10.1007/s00417-019-04482-0

Cited by 40 publications

(35 citation statements)

References 44 publications

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“…The image (shape) obtained by CASIA2 was corrected based on a fixed refractive index at each segment. According to previous reports, the values obtained by CASIA2, including the CT, aqueous depth (AQD), and LT, exhibited good repeatability 21 . Furthermore, there were no statistically significant differences with those obtained with other instruments, such as ultrasonography and the Scheimpflug camera 21 .…”

Section: Discussionsupporting

confidence: 58%

“…According to previous reports, the values obtained by CASIA2, including the CT, aqueous depth (AQD), and LT, exhibited good repeatability 21 . Furthermore, there were no statistically significant differences with those obtained with other instruments, such as ultrasonography and the Scheimpflug camera 21 . However, the measured values of the anterior and the posterior curvature radii of the crystalline lens and ESD generated concerns.…”

Section: Discussionsupporting

confidence: 58%

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Development of a new intraocular lens power calculation method based on lens position estimated with optical coherence tomography

Satou

Shimizu

Tsunehiro

et al. 2020

Sci Rep

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A new method is developed and validated for intraocular lens (IOL) power calculation based on paraxial ray tracing of the postoperative IOL positions, which are obtained with the use of anterior segment optical coherence tomography. Of the 474 eyes studied, 137 and 337 were grouped into training and validation sets, respectively. The positions of the implanted IOLs of the training datasets were characterized with multiple linear regression analyses one month after the operations. A new regression formula was developed to predict the postoperative anterior chamber depth with the use of the stepwise analysis results. In the validation dataset, postoperative refractive values were calculated according to the paraxial ray tracing of the cornea and lens based on the assumption of finite structural thicknesses with separate surface curvatures. the predicted refraction error was calculated as the difference of the expected postoperative refraction from the spherical-equivalent objective refraction values. The percentage error (within ±0.50 diopters) of the new formula was 84.3%. This was not significantly correlated to the axial length or keratometry. The developed formula yielded excellent postoperative refraction predictions and could be applicable to eyes with abnormal proportions, such as steep or flat corneal curvatures and short and long axial lengths.open Scientific RepoRtS | (2020) 10:6501 | https://doi.org/10.1038/s41598-020-63546-ywww.nature.com/scientificreports www.nature.com/scientificreports/ previously reported the relationship between the crystalline lens parameter and the IOL position 18 . Goto et al. 19 developed a formula to predict postoperative ACD, including the angle-to-angle (ATA) depth obtained by presented a method to accurately estimate and quantify the entire shape of the crystalline lens from OCT data, and reported that the preoperative anterior segment parameters were exceptionally valuable for estimating the IOL position. Yoo et al. 17 reported improvements in refractive outcomes by the ray-tracing method using the equatorial plane position of the lens.Paraxial ray tracing repeats simple calculations without special software or complexity. The predictive accuracy of IOL power calculations with paraxial ray tracing including the IOL positions predicted by the AS-OCT has not been clarified.Correspondingly, the aims of the present study are a) the development of a new formula based on paraxial ray tracing for IOL power calculations that utilize the postoperative IOL positions obtained using AS-OCT, and b) the validation of the accuracy of the developed formula. Scientific RepoRtS |(2020) 10:6501 | https://doi.

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Section: Discussionsupporting

confidence: 58%

Section: Discussionsupporting

confidence: 58%

Development of a new intraocular lens power calculation method based on lens position estimated with optical coherence tomography

Satou

Shimizu

Tsunehiro

et al. 2020

Sci Rep

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“…Anterior chamber depth (ACD) is the distance from corneal epithelium to anterior surface of crystalline lens, while aqueous depth (AQD) is the distance from corneal endothelium to anterior surface of crystalline lens [ 3 ]. ACD and AQD are important parameters that can be used to calculate intraocular lens (IOL) power, select candidates for phakic IOL implantation, and screen for primary angle closure glaucoma [ 3 – 5 ].…”

Section: Introductionmentioning

confidence: 99%

“…The first commercially available OCT device designed for anterior segment measurement was a time-domain OCT (TD-OCT). Since then, an increasing number of OCT devices were developed, including the newly designed TD-OCT, spectral-domain OCT (SD-OCT), and swept-source OCT (SS-OCT) [ 5 , 8 – 10 ]. The Visante OCT (Carl Zeiss Meditec, Dublin, CA, USA) is a TD-OCT, using a light source of 1310 nm super-luminescent light-emitting diode.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Anterior Ocular Biometric Measurements Using Swept-Source and Time-Domain Optical Coherence Tomography

Chen

McAlinden

et al. 2020

Journal of Ophthalmology

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Purpose. To compare central corneal thickness (CCT), aqueous depth (AQD), and anterior chamber depth (ACD) measurements using the swept-source (CASIA SS-1000, Tomey, Japan) and time-domain (Visante, Carl Zeiss Meditec, USA) anterior segment optical coherence tomographers (OCT) in normal eyes. Methods. Sixty-eight eyes of 68 subjects were included. Three consecutive scans of each subject were obtained using both devices in a random order by one experienced operator. Standard deviation (Sw), coefficient of repeatability (CoR), coefficients of variation (CoV), and intraclass correlation coefficients (ICC) were used to evaluate the intraoperator repeatability. Agreement was assessed using the Bland–Altman plots and 95% limits of agreement (LoA). Results. All measurements of the swept-source OCT (SS-OCT) and time-domain OCT (TD-OCT) showed high repeatability with low CoR (CCT: 2.34 μm and 6.16 μm; AQD: 0.05 mm and 0.09 mm; ACD: 0.06 mm and 0.09 mm), low CoV (CCT: 0.16% and 0.42%; AQD: 0.61% and 0.97%; ACD: 0.53% and 0.83%), and high ICC (>0.98). The mean CCT with SS-OCT was slightly thicker than the results with TD-OCT (difference = 4.55 ± 2.62 μm, P<0.001). There was no statistically significant difference in AQD or ACD measurements between the two devices (0.01 ± 0.05 mm, P=0.111; 0.02 ± 0.05 mm, P=0.022, respectively). The 95% LoA between the SS-OCT and TD-OCT were −0.59 to 9.69 μm for CCT, −0.10 to 0.12 mm for AQD, and −0.09 to 0.12 mm for ACD. Conclusions. High levels of repeatability and agreement were found between the two devices for all three parameters, suggesting interchangeability. SS-OCT demonstrated superior repeatability compared with TD-OCT.

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“…Nevertheless, as they used a shorter wavelength light source (around 840 nm), SD-OCT devices had a limited image depth range. Recently, the use of a longer wavelength light source combined with swept-source OCT (SS-OCT) technology has allowed a greater image depth and high-contrast imaging of the entire anterior segment, from the cornea to the posterior surface of the lens 6,7 .…”

mentioning

confidence: 99%

Repeatability of automated measurements by a new anterior segment optical coherence tomographer and biometer and agreement with standard devices

Schiano-Lomoriello

Hoffer

Abicca

et al. 2021

Sci Rep

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We assess repeatability of automatic measurements of a new anterior segment optical coherence tomographer and biometer (ANTERION) and their agreement with those provided by an anterior segment-optical coherence tomography device combined with Placido-disk corneal topography (MS-39) and a validated optical biometer (IOLMaster 500). A consecutive series of patients underwent three measurements with ANTERION and one with MS-39. A subgroup of patients underwent biometry also with IOLMaster 500. Repeatability was assessed by means of within-subject standard deviation, coefficient of variation (COV), and intraclass correlation coefficient (ICC). Agreement was investigated with the 95% limits of agreement. Paired t-test and Wilcoxon matched-pairs test were performed to compare the measurements of the different devices. Repeatability of ANTERION measurements was high, with ICC > 0.98 for all parameters except astigmatism (0.963); all parameters apart from those related to astigmatism revealed a COV < 1%. Repeatability of astigmatism improved when only eyes whose keratometric astigmatism was higher than 1.0 D were investigated. Most measurements by ANTERION and MS-39 showed good agreement. No significant differences were found between measurements by ANTERION and IOLMaster, but for corneal diameter. ANTERION revealed high repeatability of automatic measurements and good agreement with both MS-39 and IOLMaster for most parameters.

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Comparison of anterior segment and lens biometric measurements in patients with cataract

Cited by 40 publications

References 44 publications

Development of a new intraocular lens power calculation method based on lens position estimated with optical coherence tomography

Development of a new intraocular lens power calculation method based on lens position estimated with optical coherence tomography

Comparison of Anterior Ocular Biometric Measurements Using Swept-Source and Time-Domain Optical Coherence Tomography

Repeatability of automated measurements by a new anterior segment optical coherence tomographer and biometer and agreement with standard devices

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