Reproducibility of Optic Disc Measurements With Computerized Analysis of Stereoscopic Video Images

Caprioli, Joseph; Klingbeil, Ulrich; Sears, Marvin L.; Pope, Bryony

doi:10.1001/archopht.1986.01050190093046

Cited by 122 publications

(23 citation statements)

References 6 publications

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“…Digital analysis of steroscopic imates acquired with conventional optics [8, 9, 10, 11, 12, 13] and confocal detection [14, 15, 16, 17, 18, 19, 20] are two different approaches to quantify the optic disk topography. To compare the reproducibility of these systems, we studied the same eyes because the variability of these instruments may in part depend on the characteristics of the eye (corneal curvature, axial length, refractive error) and the optic disk (skewness of the cup, tilting of the optic disk).…”

Section: Discussionmentioning

confidence: 99%

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Reproducibility of Optic Disk Topographic Measurements with the Topcon ImageNet and the Heidelberg Retina Tomograph

Azuara‐Blanco

Harris²,

Cantor

1998

Ophthalmologica

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Objective: To compare the reproducibility of optic disk measurements provided by an image analyzer and a scanning laser tomograph. Methods: Ten images of the same eye of 10 normal volunteers were taken with the Heidelberg Retina Tomograph and with the Topcon ImageNet. Intraclass correlation coefficient (ICC) and coefficient of variation (CV) were used to evaluate the reproducibility of the measurements. Results: Eleven parameters were analyzed with the Topcon ImageNet. Six parameters (55%) had ICC greater than 90%. Four parameters (36%) had CV less than 10%. Twelve parameters were evaluated with the Heidelberg Retina Tomograph. Nine parameters (75%) had ICC over 90%. Nine parameters (75%) had CV less than 10%. Conclusion: Both systems provided reproducible data. The optic disk parameters provided by the Heidelberg Retina Tomograph had a better reproducibility than those obtained from the Topcon ImageNet.

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Section: Discussionmentioning

confidence: 99%

“…The reproducibility of these systems has been reported [8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20], but differences between populations and statistical analysis make their comparison inadequate.…”

Section: Introductionmentioning

confidence: 99%

Reproducibility of Optic Disk Topographic Measurements with the Topcon ImageNet and the Heidelberg Retina Tomograph

Azuara‐Blanco

Harris²,

Cantor

1998

Ophthalmologica

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“…None of the included studies of ophthalmoscopy, RNFL photography, HRT II or GAT reported the time taken to perform the test. One study reported this information for optic disc photography, 197 three for OKP, 154,170,212 four for SAP suprathreshold, 159,162,164,174 four for SAP threshold, all of which used SITA standard or SITA fast, 176,195,198,206 four for FDT C-20-1, 170,185,187,214 two for FDT C-20-5 155,187 and one for NCT. 164 The information provided on time taken to perform the test should be interpreted with this limitation in mind.…”

Section: Higher Quality Studiesmentioning

confidence: 99%

The clinical effectiveness and cost-effectiveness of screening for open angle glaucoma: a systematic review and economic evaluation

Burr¹,

Mowatt²,

Hernández³

et al. 2007

Health Technol Assess

325

380

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“…In glaucoma, due to the known limits of perimetry [1], the definition of a 'real' change in optic disc morphology is o f paramount importance for both early diagnosis and follow-up o f the disease [14][15][16], Intra observer intra-image variation ranging from 1 to 7% and inter-observer intra-image variation ranging from 1 to 55% was shown using the Image-net System 2000 [8], In glauco matous eyes, optic disc linear measurements such as verti cal and horizontal disc diameter, disc area, rim area, per formed with the Rodenstock Nerve Head Analyzer, had COVs lower than either area measurement COVs or volume COVs [17], Using a computer-assisted planimetric system, inter-image COVs ranging from 2.4 to 18% and intra-image COVs ranging from 2 to 7% were found [10]. With the Laser Scanning Tomograph (Heidelberg R.) COVs be tween 2.6 and 11% were obtained for optic disc cup volume [18].…”

Section: Discussionmentioning

confidence: 99%

Study of the Correlation between Average Values of Optic Disc Parameters and Their Measurement Variability using Stereovideographic Digital Analysis

Iester

Traverso²,

Rolando³

et al. 1995

Ophthalmologica

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Purpose of our study was to find whether there is a correlation between average values of optic nerve head parameters and their coefficient of variation for repeated measurements. Disc stereo video images were taken with Topcon Image-net (IS100) and analyzed with the Optic Disc Analysis(c) program. Eleven normal and 9 glaucomatous eyes were selected. A significant correlation was found for horizontal cup/disc ratio (r =––0.037, p = 0.037) and disc area (r = 0.776, p = 0.027) in intra-observer intra-image repeated measurements. Vertical, horizontal and average cup/disc ratios (r=––0.81, r = ––0.74, r=––0.78 p < 0.05) showed a significant correlation for intra-observer inter-image repeated measurements. For inter-observer intra-image measurements, a significant correlation was present for average cup/disc ratio (r = ––0.64 p = 0.043). Our data show that bidimensional semiquantitative parameters in use for optic nerve head assessment, analyzed by computerized stereovideography, have an intrinsic measurement variability. The variability is significantly related to the value of the measured parameter only when their reference points are determined manually by the operator.

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Reproducibility of Optic Disc Measurements With Computerized Analysis of Stereoscopic Video Images

Cited by 122 publications

References 6 publications

Reproducibility of Optic Disk Topographic Measurements with the Topcon ImageNet and the Heidelberg Retina Tomograph

Reproducibility of Optic Disk Topographic Measurements with the Topcon ImageNet and the Heidelberg Retina Tomograph

The clinical effectiveness and cost-effectiveness of screening for open angle glaucoma: a systematic review and economic evaluation

Study of the Correlation between Average Values of Optic Disc Parameters and Their Measurement Variability using Stereovideographic Digital Analysis

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