Optic nerve head analyser and Heidelberg retina tomograph: accuracy and reproducibility of topographic measurements in a model eye and in volunteers.

Abstract

The accuracy and reproducibility of the optic nerve head analyser (ONHA) and the Heidelberg retina tomograph (HRT) were compared and the performance of the HRT in measuring fundus elevations was evaluated. The

Comparison of Optic Disc Topography Measured by Retinal Thickness Analyzer with Measurement by Heidelberg Retina Tomograph II

“…Janknecht and Funk 9 reported that the pooled relative error of the cup volume was 11.3% in the model eye, and the pooled CVs of the cup volume were 6.9% in volunteers and 2.4% in the model eye. Rohrschneider et al 10 reported that the mean CVs for measurement in patients with glaucoma, glaucoma suspects, and control groups (n ϭ 13 in each group) were 2.9%, 5.0%, and 3.4%, respectively, for cup area; 4.9%, 4.6%, and 4.6% for cup volume; 5.2%, 3.8%, and 3.3% for mean cup depth; and 5.2%, 4.1%, and 4.0% for maximum cup depth.…”

“…Accurate and good reproducibility of measurements obtained using these confocal SLOs was reported. [9][10][11][12][13][14][15] The Retinal Thickness Analyzer (RTA; Talia, Technology Ltd., Neve-Ilan, Israel), a digitized laser slit-lamp that uses helium-neon laser (wavelength, 543 nm) as a light source, was originally introduced to evaluate retinal thickness throughout the posterior pole. 16,17 Recently, software that was customized to determine the border of the vitreoretinal interface was added to the RTA, which enables the ophthalmologist to create a topographic map of the optic DISK TOPOGRAPHY MEASURED BY RTA AND BY HRT II disc.…”

Estimating the clinical usefulness of optic disc biometry for detecting glaucomatous change over time

“…So far, SLO-studies have mainly evaluated the usefulness of optic disc parameters for glaucoma detection, their reproducibility of measurements and any correlations with visual field defects. [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] However, relatively little attention has been paid to the possible value of SLO optic disc biometry for improvement of glaucoma follow-up. [20][21][22] To reliably detect development or progression of disease with a certain measurement parameter, it is necessary to know the absolute difference between follow-up measurements that must be exceeded to detect a statistically significant change over time.…”

Inter-device reproducibility of the scanning laser polarimeter with variable cornea compensation

“…In contrast, comprehensive intradevice reproducibility data exist for the different imaging devices. 11,[13][14][15][16][17][18] Subject C did not undergo a full eye examination and visual field, and is hence only presumed to be normal. As glaucomatous eyes have previously demonstrated higher showing the between-device distribution of measurements for each subject.…”