Comparison of biometry and intraocular lens power calculation performed by a new optical biometry device and a reference biometer

Ventura, Bruna Vieira; Ventura, Marcelo Carvalho; Wang, Li; Koch, Douglas D.; Weikert, Mitchell P.

doi:10.1016/j.jcrs.2016.11.033

Cited by 34 publications

(22 citation statements)

References 18 publications

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“…Thirdly, we did not compare biometric parameters with other standard optical biometers, ie, IOL Master or Lenstar LS 900. Since sufficient evidence comparing between Pentacam AXL and IOL Master was retrieved, 8 , 10 , 11 , 18 , 21 , 22 it makes indirect comparisons among various devices possible. Corneal curvatures and axial length measured by Pentacam AXL seemed to have good agreement with those measured by IOL Master.…”

Section: Discussionmentioning

confidence: 99%

Comparison of Anterior Segment Parameters and Axial Length Using Two Scheimpflug Devices with Integrated Optical Biometers

Supiyaphun

Rattanasiri

Jongkhajornpong

2020

OPTH

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Purpose To assess the repeatability of anterior segment parameters and axial length (AL) using Pentacam AXL and Galilei G6 and the agreement between both devices. Materials and Methods Eighty-four eyes of 84 participants were measured prospectively with two devices. Outcome measurements included corneal curvatures, anterior chamber depth (ACD), AL, pupil size, and white-to-white distance (WTW). Intra-device repeatability was assessed using intraclass correlation coefficient (ICC), within-subject standard deviation (Sw), test–re-test repeatability (TRT=2.77 Sw), and coefficient of variation (CoV). Agreement between two devices was analyzed using Bland–Altman plots. Results For each device, the Sw of corneal curvatures, ACD, and AL were lower than 0.25 D, 0.04 mm, and 0.04 mm, respectively. The ICC was higher than 0.90 in all parameters measured by Pentacam AXL, whereas three parameters measured by Galilei G6 (steep meridian at anterior and posterior cornea, and pupil size) were lower than 0.90. Comparing to Galilei G6, Pentacam AXL led to significantly lower mean anterior cornea curvatures (Km) with the mean difference (95% level of agreement; LoA) of −0.12 D (−0.36, 0.12, P <0.001). For ACD, there was no significant difference between the two devices. Pentacam AXL led to significantly lower AL, pupil size, and WTW, with the mean differences (95% LoA) of −0.04 mm (−0.35, 0.27), −0.18 mm (−0.71, 0.35), and −0.35 mm (−0.61, −0.10), respectively. Conclusion We found good repeatability of corneal curvature, ACD, and AL in both devices. Most parameters obtained from Pentacam AXL were statistically significantly different from those obtained from Galilei G6, except for steep meridians and ACD.

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Section: Discussionmentioning

confidence: 99%

Comparison of Anterior Segment Parameters and Axial Length Using Two Scheimpflug Devices with Integrated Optical Biometers

Supiyaphun

Rattanasiri

Jongkhajornpong

2020

OPTH

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“…New surgical techniques in conjunction with technological advances have improved the accuracy of biometry data and intraocular lens calculations. 1,2 A number of devices have proven to be reliable in calculating pre-cataract surgery measurements, including low-coherence reflectometry (Lenstar LS 900, Haag-Streit AG), Scheimpflung camera-based devices (Galilei G6, Ziemer Ophthalmic Systems AG; Pentacam, Oculus, Wetzlar, Germany) [3][4][5] and partial coherence interferometry (IOLMaster 500 and 700, Zeiss, Oberkochen, Germany). 6 The IOLMaster device is currently the most widely used device for biometric measurements.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Biometry Measurements Using Standard Partial Coherence Interferometry versus New Scheimpflug Tomography with Integrated Axial Length Capability

Haddad¹,

Barnwell²,

Rocha³

et al. 2020

OPTH

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Purpose: To compare biometry measurements obtained by a partial interferometer biometer (IOLMaster 500) to the new Scheimpflug tomography with an integrated axial length biometer module (Pentacam AXL). Patients and Methods: Cataract patients who underwent biometric measurements with the IOL Master 500 and the Pentacam AXL from July to November 2017 were enrolled in this study. Comparisons were performed for axial length (AL), keratometry (K), and anterior chamber depth (ACD). The Pearson correlation coefficient and the 95% limits of agreement (LoA) were calculated. Paired Student's t-tests and Bland-Altman plots were used to assess the differences between devices. Results: One hundred and sixty-six eyes of 92 patients were analyzed. There were no statistically significant differences in AL (p=0.558) or flat K (p=0.196) values between the IOL Master 500 and Pentacam AXL measurements. Statistically significant differences were found between the two devices with respect to steep K, ACD, and mean K measurements (p<0.001). Conclusion: Both devices provided similar measurements of AL and flat K, though there were statistically significant differences in ACD, steep K, and mean K measurements.

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“…There are few studies comparing these new devices to the ''gold standard'' optical biometer, the IOL Master 500 [7][8][9]. Recent study retrospectively compared the Galilei G6 with the IOL Master 500.…”

Section: Introductionmentioning

confidence: 99%

“…Recent study retrospectively compared the Galilei G6 with the IOL Master 500. The devices provided similar mean IOL power, axial length (AL), keratometric and anterior chamber depth (ACD) measurements, but the authors suggested they should not be used interchangeably for biometric measurements and IOL power calculations [7]. Studies comparing the Pentacam AXL to other optical biometers found inconsistent results.…”

Section: Introductionmentioning

confidence: 99%

Comparison of anterior segment parameters and axial length measurements performed on a Scheimpflug device with biometry function and a reference optical biometer

Muzyka−Woźniak¹,

Oleszko

2018

Int Ophthalmol

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Purpose To compare measurements of axial length (AL), corneal curvature (K), anterior chamber depth (ACD) and white-to-white (WTW) distance on a new device combining Scheimpflug camera and partial coherence interferometry (Pentacam AXL) with a reference optical biometer (IOL Master 500). To evaluate differences between IOL power calculations based on the two biometers. Methods Ninety-seven eyes of 97 consecutive cataract or refractive lens exchange patients were examined preoperatively on IOL Master 500 and Pentacam AXL units. Comparisons between two devices were performed for AL, K, ACD and WTW. Intraocular lens (IOL) power targeting emmetropia was calculated with SRK/T and Haigis formulas on both devices and compared. Results There were statistically significant differences between two devices for all measured parameters (P \ 0.05), except ACD (P = 0.36). Corneal curvature measured with Pentacam AXL was significantly flatter then with IOL Master. The mean difference in AL was clinically insignificant (0.01 mm; 95% LoA 0.16 mm). Pentacam AXL yielded higher IOL power in 75% of eyes for Haigis formula and in 62% of eyes for SRK/T formula, with a mean difference within ± 0.5 D for 72 and 86% of eyes, respectively. Conclusions There were statistically significant differences between AL, K and WTW measurements obtained with the compared biometers. Flatter corneal curvature measurements on Pentacam AXL necessitate formulas optimisation for Pentacam AXL.

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Comparison of biometry and intraocular lens power calculation performed by a new optical biometry device and a reference biometer

Abstract: The 2 devices were comparable with regard to mean IOL power, mean AL, K, and ACD measurements. However, the wide range of differences between the devices suggests they should not be used interchangeably.

Cited by 34 publications

References 18 publications

<p>Comparison of Anterior Segment Parameters and Axial Length Using Two Scheimpflug Devices with Integrated Optical Biometers</p>

<p>Comparison of Anterior Segment Parameters and Axial Length Using Two Scheimpflug Devices with Integrated Optical Biometers</p>

<p>Comparison of Biometry Measurements Using Standard Partial Coherence Interferometry versus New Scheimpflug Tomography with Integrated Axial Length Capability</p>

Comparison of anterior segment parameters and axial length measurements performed on a Scheimpflug device with biometry function and a reference optical biometer

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