Repeatability and agreement of Scheimpflug-based and swept-source optical biometry measurements

Sel, Saadettin; Stange, Jana; Kaiser, Delia; Kiraly, Laszlo

doi:10.1016/j.clae.2017.03.007

Cited by 68 publications

(74 citation statements)

References 13 publications

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“…This is close to the results of two recent studies, which report that the Pentacam AXL returns readings that, respectively, differ by a mean of 0.05 mm relative to the IOL Master 700 [9] and 0.026 mm relative to the IOL Master 500 [8]. Such a small difference should not influence IOL power calculation.…”

Section: Discussionsupporting

confidence: 89%

“…Shajari compared the Pentacam AXL with the IOL Master 500 and the IOL Master 700 and found no statistically significant differences in AL, keratometry and ACD measurements performed with the three devices [8]. Sel comparing the Pentacam AXL with the IOL Master 700 found significant differences for keratometry values, AL and ACD measurements [9].…”

Section: Introductionmentioning

confidence: 98%

“…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%

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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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Section: Discussionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 98%

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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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“…Other optical techniques including partial coherence interferometry, optical coherence tomography, laser Doppler interferometry and optical low coherence reflectometry have also become popular, driven by many factors such as the importance of accurate measurement of ocular dimensions for cataract surgery and necessity in myopia research (Table ). Given the various measurement techniques and devices, investigations revealed good repeatability and reproducibility and good agreement between the devices . At the time of this review, devices using laser Doppler interferometry technology have not become commercially available.…”

Section: Methods Of Measuring Axial Elmentioning

confidence: 99%

Peripheral eye length measurement techniques: a review

Mekountchou

Conrad

Sankaridurg

et al. 2020

Clinical and Experimental Optometry

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Along with the rising myopia epidemic is the increasing interest in any ocular parameter that might inform understanding of myopia progression. The relationship between eye length and myopia has long been established but the recent interest in the central and peripheral retina, eye shape, retinal contour, and refractive error development is attracting more clinical and research interest in peripheral eye length measurements. Therefore, peripheral eye length measurements are an important step in the ongoing research involving the peripheral retina. Since the first measurement of peripheral eye length reported in 1991, many techniques and methods have been developed, which vary in many aspects. These techniques involve custom‐built or modified commercially available instruments, with the use of off‐axis targets and other considerations such as eye or head turn of the subject. The wide range of methods and instruments used for peripheral eye length measurements make it difficult to compare results and may account for some of the variations in the reported results. Specifications of the different methods are presented along with their advantages and disadvantages. Although researchers acknowledge a good agreement between the modified commercially available optical biometers for peripheral eye length measurement, the Lenstar LS 900 appears to offer better results. Nevertheless, the introduction to the market of an instrument specially designed for peripheral eye length might overcome the issues noted with other methods and could allow for more insights in future research involving the peripheral retina. Moreover, future studies may be able to track peripheral eye length changes and its relationship to the progression of myopia and find out if those changes are responsible for or correlated with important eye conditions.

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“…[1][2][3][4][5][6][7] The latest studies published, demonstrated a perfect correlation of AL measurements performed with IOL Master 500, IOL Master 700 and Pentacam AXL, as well as a high precision of AL, ACD and corneal curvature. 8,9 The main part of our pre-cataract screening routine is focused on objective assessment of the ocular surface, the cornea, anterior chamber and crystal lens conditions. Modern tomographers, like the Pentacam, support us in detecting forme fruste keratoconus (FFKC), past refractive surgery and corneal diseases such as Fuchs endothelial dystrophy, or signs of dry eye prior to cataract surgery.…”

mentioning

confidence: 99%

Progress in Modern Cataract Surgery – New Steps and Algorithms for Precise Measuring and Intraocular-lens Calculations

Hengerer¹,

Conrad-Hengerer²

2017

European Ophthalmic Review

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In standard cataract surgery, one of the major goals is to reach target refraction. Based on keratometry measurements, axial length and anterior chamber depth, most of the intraocular lens calculation formulae are suitable to achieve this aim. Further evaluation of corneal refractive parameters like anterior and posterior corneal surface by Scheimpflug devices led to a significant enhancement of precision in astigmatic and post-refractive surgery cases.

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Repeatability and agreement of Scheimpflug-based and swept-source optical biometry measurements

Cited by 68 publications

References 13 publications

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

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

Peripheral eye length measurement techniques: a review

Progress in Modern Cataract Surgery – New Steps and Algorithms for Precise Measuring and Intraocular-lens Calculations

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