Anterior Chamber Depth Measurement in Pseudophakic Eyes: A Comparison of Pentacam and Ultrasound

Savini, Giacomo; Olsen, Thomas; Carbonara, Claudio; Pazzaglia, Sebastiano; Barboni, Piero; Carbonelli, Michele; Hoffer, Kenneth J.

doi:10.3928/1081597x-20090617-02

Cited by 18 publications

(9 citation statements)

References 38 publications

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“…Ultrasound biometry requires placing an ultrasound probe on the central cornea. It has been speculated that this contact may also cause indentation of the cornea leading to shorter axial length measurements 12. Both the Lenstar and the IOLMaster are optical devices based mainly on the noncontact laser interferometry to assess axial ocular dimensions.…”

Section: Discussionmentioning

confidence: 99%

Comparison of corneal curvature and anterior chamber depth measurements using the manual keratometer, lenstar LS 900 and the pentacam

Uçakhan

Akbel

Biyikli

et al. 2013

Middle East Afr J Ophthalmol

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Purpose:The purpose of this study was to compare keratometry and anterior chamber depth (ACD) measurements from the Lenstar LS 900 (Haag-Streit AG, Switzerland) and the Pentacam (Oculus, Weltzar, Germany), and compare the keratometry readings of these two systems to a manual keratometer (MK), (Haag-Streit, Switzerland).Materials and Methods:In this prospective study, keratometry and ACD measurements were obtained in 50 eyes of 50 normal subjects with the Lenstar and the Pentacam. Keratometry was also measured using a MK. Correlation, comparison, and interdevice agreement was evaluated using intraclass correlation analysis, Wilcoxon test, and Bland-Altman plots.Results:The keratometry and ACD measurements obtained from the Lenstar and the Pentacam showed excellent correlation. The mean interdevice differences in mean keratometry (Km) for the Lenstar and the Pentacam, the Lenstar and the MK, and the Pentacam and the MK were 0.39 D, 0.10 D, and 0.30 D respectively; and the 95% limits of agreement (LoA) for Km were 0.04-0.82 D; −1.90-2.10 D; and −2.30-1.70 D, respectively. The mean interdevice difference in ACD for the Lenstar versus the Pentacam was 0.09 mm, with 95% LoA of 0.23-0.05 mm.Conclusions:The ACD measurements obtained using the Lenstar and the Pentacam seem to be interchangeable, whereas, the keratometry measurements obtained using the Lenstar, Pentacam, and MK differ considerably, and are not interchangeable.

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Section: Discussionmentioning

confidence: 99%

Comparison of corneal curvature and anterior chamber depth measurements using the manual keratometer, lenstar LS 900 and the pentacam

Uçakhan

Akbel

Biyikli

et al. 2013

Middle East Afr J Ophthalmol

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“…Reuland and colleagues found an even smaller difference between Pentacam and IOLMaster [11]. Savini and colleagues theorize that the small difference between the Scheimpflug and ultrasound measurements occurs due to a misidentification of the anterior edge of the anterior lens capsule with the Pentacam [12]. On the other hand, Nemeth and colleagues found no significant difference between Pentacam and traditional ultrasound in phakic eyes; they did find that the Pentacam measured significantly smaller ACD measurements than ultrasound in pseudophakic eyes [13].…”

Section: Discussionmentioning

confidence: 99%

Comparison of Anterior Chamber Depth Measurements from the Galilei Dual Scheimpflug Analyzer with IOLMaster

Patel

Pandit

2012

Journal of Ophthalmology

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Purpose. To compare anterior chamber depth (ACD), representing the distance between the anterior corneal surface and anterior lens surface measurements between the Galilei Dual Scheimpflug Analyzer and the IOLMaster. Methods. A retrospective review of 65 individual patient eyes with normal anterior segments, and no prior ocular surgery was performed. Patients underwent ACD measurements with both devices during the same session by a trained examiner. Interdevice agreement was evaluated using paired two-tailed t-tests, Pearson correlation coefficient, and Bland-Altman analysis. Results. The mean ± standard deviation (SD) ACD for the Galilei and IOLMaster was 3.37 ± 0.36 mm (range from 2.62 to 4.13) and 3.25 ± 0.38 mm (range from 2.34 to 3.92), respectively (Pearson correlation coefficient = 0.96). ACD mean difference was 0.12 mm (P < 0.0001); 95% limits of agreement was from −0.09 to 0.34. The Galilei measured slightly longer ACD values than the IOLMaster. There was no relationship between axial length and interdevice difference. Conclusion. ACD measurements correlate well between the Galilei and IOLMaster, with Galilei values on average 0.12 mm longer than the IOLMaster.

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“…Provided the differences within d ± 1.96s are not clinically important (clinical interpretation is an essential attribute of this approach), the two measurements could be used interchangeably. In the above example the 'limits of agreement' would be: 20 Refraction 0.991 Shemesh et al 40 Intraocular pressure 0.84 Savini et al 41 Anterior chamber depth 0.98…”

Section: Agreementmentioning

confidence: 99%

Statistical methods for conducting agreement (comparison of clinical tests) and precision (repeatability or reproducibility) studies in optometry and ophthalmology

McAlinden

Khadka

Pesudovs

2011

Ophthalmic Physiologic Optic

361

306

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The ever-expanding choice of ocular metrology and imaging equipment has driven research into the validity of their measurements. Consequently, studies of the agreement between two instruments or clinical tests have proliferated in the ophthalmic literature. It is important that researchers apply the appropriate statistical tests in agreement studies. Correlation coefficients are hazardous and should be avoided. The 'limits of agreement' method originally proposed by Altman and Bland in 1983 is the statistical procedure of choice. Its step-by-step use and practical considerations in relation to optometry and ophthalmology are detailed in addition to sample size considerations and statistical approaches to precision (repeatability or reproducibility) estimates.

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Anterior Chamber Depth Measurement in Pseudophakic Eyes: A Comparison of Pentacam and Ultrasound

Abstract: In pseudophakic eyes, the Pentacam provides ACD values that do not statistically differ from those of ultrasound immersion biometry, on the condition that manual measurements are used rather than automatic ones.

Cited by 18 publications

References 38 publications

Comparison of corneal curvature and anterior chamber depth measurements using the manual keratometer, lenstar LS 900 and the pentacam

Comparison of corneal curvature and anterior chamber depth measurements using the manual keratometer, lenstar LS 900 and the pentacam

Comparison of Anterior Chamber Depth Measurements from the Galilei Dual Scheimpflug Analyzer with IOLMaster

Statistical methods for conducting agreement (comparison of clinical tests) and precision (repeatability or reproducibility) studies in optometry and ophthalmology

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