Repeatability and agreement of ocular biometry measurements: Aladdin versus Lenstar

McAlinden, Colm; Yu, A-Yong; Wang, Xiaorui; Yang, Jing; Yu, Yang; Chen, Hao; Wang, Qinmei; Huang, Jinhai

doi:10.1136/bjophthalmol-2016-309365

Cited by 33 publications

(31 citation statements)

References 35 publications

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“…If an "OK" was not achieved, the measurement acquisition was repeated until an "OK" was achieved. The Pentacam is a comprehensive anterior segment tomographer [16,17] and the Lenstar LS900 is an optical biometer [18,19]. The Corvis ST is a noncontact tonometer with an ultra-high-speed (4330 frames/s) Scheimpflug camera incorporated.…”

Section: Methodsmentioning

confidence: 99%

Corneal biomechanical properties in myopic eyes evaluated via Scheimpflug imaging

Shao

Pan

et al. 2020

BMC Ophthalmol

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Background: To investigate the biomechanical properties of the cornea in myopic eyes using corneal visualization Scheimpflug technology (Corvis ST). The relationships between the biomechanical properties of the cornea and the degree of myopia were also investigated. Methods: 265 eyes of 265 subjects were included. Based on spherical equivalent (SE) in diopters (D), participants were divided into four groups: low myopia/control (SE: − 0.50 to − 3.00D), moderate myopia (SE: − 3.00 to − 6.00D), high myopia (SE: − 6.00 to − 10.00D) and severe myopia (SE greater than − 10.00D). Axial length (AL), anterior segment parameters, and corneal biomechanical properties were obtained with the Lenstar LS900, Pentacam HR and Corvis ST, respectively. Results: Mean (±SD) SE was − 7.29 ± 4.31D (range: − 0.63 to − 25.75D). Mean AL was 26.31 ± 1.82 mm (range: 21.87 to 31.94 mm). Significant differences were detected within the four groups in terms of six corneal biomechanical parameters: deformation amplitude (DA), time from start until second applanation (A2-time), length of flattened cornea at the second applanation (A2-length), corneal velocity during the first and second applanation (A2-velocity), time from start to highest concavity (HC-time), and central curvature at highest concavity (HC radius). AL was positively associated with DA whereas negatively associated with A1-velocity and A2-length. SE was positively associated with A2-time, HC-time and A2-velocity, whereas negatively associated with DA. IOP was positively associated with four corneal biomechanical parameters and negatively associated with three parameters. Conclusions: Eyes with severe myopia showed greater DA, lesser A2 time, HC time, and faster A2-velocity compared to low to high myopia. This suggests the cornea becomes weaker and more deformable with elongation of axial length with corresponding increases in myopia. DA, A2-time and A2-velocity could be useful corneal biomechanical indicators in patients with myopia.

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Section: Methodsmentioning

confidence: 99%

Corneal biomechanical properties in myopic eyes evaluated via Scheimpflug imaging

Shao

Pan

et al. 2020

BMC Ophthalmol

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“…In order to gain widespread use in clinical and research settings, a new device must provide measurements that are repeatable and in agreement with other currently established devices that measure the same parameter [ 1 ]. Nevertheless, it should be taken into account that ocular biometers could have insensitivities and errors intrinsic to the measure procedure that could result in differences between measurements, observers, or equipment [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

Agreement and Repeatability of Two Biometers to Measure Anterior Segment Components: Refractive Error Effect

Domínguez‐Vicent

Brautaset

2018

Med Sci Monit

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BackgroundTo assess the repeatability and agreement between a new high-resolution optical coherence tomographer (OCT) and a Scheimpflug topographer.Material/MethodsSixty phakic and healthy participants were measured in this study, and one eye per participant was analyzed. Depending on their refractive error, each participant was allocated into a myopic, hyperopic, or emmetropic group. The Cirrus HD-OCT 5000 (Carl Zeiss Meditec, Jena, Germany), and the Sirius Scheimpflug topographer (Costruzione Strumenti Oftalmici, Florence, Italy) were used to take all measurements.ResultsThe repeatability of these instruments to measure the anterior chamber depth, angle-to-angle, thinnest pachymetry, and both nasal and temporal angles was smaller than 0.15 mm, 0.40 mm, 10 μm, and 10 degrees, respectively. However, the repeatability of the Scheimpflug instrument to measure the apex pachymetry was about 15 μm, and for the OCT, it was about 4 μm for all groups. On average, the Sirius Scheimpflug instrument measured shallower anterior chamber depth (about 0.10 mm), shorter angle-to-angle (about 0.5 mm), thinner corneas (approximately 10 μm), and narrower angles (around 5 degrees) for all refractive groups.ConclusionsThe repeatability of the Cirrus OCT and Sirius Scheimpflug instrument was good and independent of the refractive error. Nevertheless, to judge whether these instruments could be used interchangeable, clinical criteria are needed.

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“…The Pentacam is an comprehensive anterior segment tomographer [23,24]and the Lenstar LS900 is an optical biometer. [25,26]…”

Section: Methodsmentioning

confidence: 99%

Corneal biomechanical properties in myopic eyes evaluated via Scheimpflug imaging

Shao

Pan

et al. 2020

Preprint

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Background To investigate the biomechanical properties of the cornea in myopic eyes using corneal visualization scheimpflug technology (Corvis ST). The relationships between the biomechanical properties of the cornea and the degree of myopia were also investigated.Methods 265 eyes of 265 subjects were included. According to spherical equivalent (SE) in diopters (D), participants were divided into four groups: low myopia/control group (SE: -0.50 to -3.00D), moderate myopia group (SE: -3.00 to -6.00D), high myopia group (SE: -6.00 to -10.00D) and severe myopia group (SE greater than -10.00D). Axial length (AL), anterior segment parameters, and corneal biomechanical properties were obtained with the Lenstar LS900, Pentacam HR and Corvis ST, respectively. Results Mean (±SD) SE was -7.29±4.31D (range: -0.63 to -25.75D). Mean AL was 26.31±1.82mm (range: 21.87 to 31.94mm). Significant differences were detected within the four groups in terms of six corneal biomechanical parameters: deformation amplitude (DA), time from start until second applanation (A2-time), length of flattened cornea at the second applanation (A2-length), corneal velocity during the first and second applanation (A2-velocity), time from start to highest concavity (HC-time), and central curvature at highest concavity (HC radius). DA was positively correlated with AL ( r =0.16, P =0.009) and negatively correlated with SE ( r =-0.20, P =0.001). A2-time, A2-velocity, A2-length and HC-time were positively correlated with SE and negatively correlated with AL.Conclusions The alterations in corneal biomechanics may be associated with the degree of myopia. DA and A2-velocity may be useful corneal biomechanical indicators in patients with myopia.

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Repeatability and agreement of ocular biometry measurements: Aladdin versus Lenstar

Abstract: High levels of repeatability and agreement were found between the Aladdin and Lenstar suggesting that the devices may be used interchangeably in normal eyes with refractive error.

Cited by 33 publications

References 35 publications

Corneal biomechanical properties in myopic eyes evaluated via Scheimpflug imaging

Corneal biomechanical properties in myopic eyes evaluated via Scheimpflug imaging

Agreement and Repeatability of Two Biometers to Measure Anterior Segment Components: Refractive Error Effect

Corneal biomechanical properties in myopic eyes evaluated via Scheimpflug imaging

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