Identification of anterior chamber angle parameters with a portable SD-OCT device compared to a non-portable SD-OCT.

Abstract:

:The aim of this study is to compare a portable spectral domain optical coherence tomography (SD-OCT) device with a non-portable SD-OCT for the identification of anterior chamber angle parameters based on location of Schwalbe's line (SL) and to measure their reproducibility. 99 eyes from 46 normal, healthy participants underwent imaging of the inferior iridocorneal angle with the iVue and Cirrus SD-OCT under well-controlled low-light conditions. SL-angle opening distance (SL-AOD) and SL-trabecular iris space area (SL-TISA) were measured by masked, certified graders at the Doheny Image Reading Center using customized Image J grading software. Inter- and intrainstrument, as well as inter- and intraobserver reproducibility of SL-AOD and SL-TISA measurements were evaluated with intraclass correlation coefficients (ICCs) and Bland-Altman plots with limits of agreement. The mean SL-AOD was 0.814 ± 0.315 mm with the iVue and 0.797 ± 0.294 mm with the Cirrus. The mean SL-TISA was 0.247 ± 0.112 mm2 with iVue and 0.259 ± 0.113 mm2 with Cirrus. Interinstrument correlation coefficients (r) were 0.93 (P < 0.0001), 0.92 (P < 0.0001), and 0.92 (P < 0.0001) for SL_AOD and SL_TISA, respectively. Intraclass correlation coefficient showing the degree of agreement among SL-AOD and SL-TISA was 0.923 (95 % confidence interval 0.885-0.948) and 0.921 (95 % confidence interval 0.883-0.947) for both devices. The agreement for intrainstrument (ICCs > 0.95), intragrader (ICCs > 0.93), and intergrader (ICCs > 0.96) was excellent. Excellent agreement between the two devices was also documented with Bland-Altman analysis. Both instruments provide consistent and reproducible measurements of anterior chamber angle metrics.

journal_name

Int Ophthalmol

authors

Akil H,Marion K,Dastiridou A,Jenkins D,Kramer B,Francis BA,Chopra V

doi

10.1007/s10792-016-0223-6

subject

Has Abstract

pub_date

2017-02-01 00:00:00

pages

31-37

issue

1

eissn

0165-5701

issn

1573-2630

pii

10.1007/s10792-016-0223-6

journal_volume

37

pub_type

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