Anterior Chamber Angle Measurement with Anterior Segment Optical Coherence Tomography: A Comparison between Slit Lamp OCT and Visante OCT

Abstract

Although Visante OCT and SLOCT demonstrate high interobserver reproducibility for anterior chamber angle measurements, their agreement was poor.

Anterior chamber angle imaging with optical coherence tomography

“…ARA 500 is the area of the angle recess bounded anteriorly by the AOD 500. (Modified from Figure 2 in Leung et al 17 ) was equally reliable for measurement of the angles. In a study comparing angle measurements between Visante OCT and SL-OCT, the inter-observer coefficient of variation ranged between 4.4 and 7.8%, and between 4.9 and 7.0%, respectively.…”

“…13 Likewise, changes in pupil size and lens position during accommodation of the eye can also influence the evaluation of the angle. Previous studies have shown good repeatability and reproducibility for measurement of AOD, TISA, ARA, and TIA with anterior segment OCT. [14][15][16][17][18] With the lighting condition standardized and the refractive error corrected using an internal fixation target, the intrasession coefficient of variation of the angle width measured with the Visante OCT was r7% and the intersession coefficient variation was r10%. 15 The SL-OCT Figure 2 Measurement of trabecular iris angle (TIA; a), angle-opening distance (AOD; b), trabecular iris space area (TISA; c), and angle recess area (ARA; d).…”

“…In a study comparing angle measurements between Visante OCT and SL-OCT, the inter-observer coefficient of variation ranged between 4.4 and 7.8%, and between 4.9 and 7.0%, respectively. 17 Nevertheless, the measurement agreement for the two instruments is poor. The spans of 95% limits of agreement of the nasal/ temporal angle measurements between the instruments were 437/531 mm, 0.174/0.186 mm 2 , and 25.3/28.01 for AOD, TISA, and TIA, respectively.…”

“…The spans of 95% limits of agreement of the nasal/ temporal angle measurements between the instruments were 437/531 mm, 0.174/0.186 mm 2 , and 25.3/28.01 for AOD, TISA, and TIA, respectively. 17 The spectral-domain OCT…”

Scanning beyond the limits of standard OCT with a Fourier domain optical coherence tomography integrated into a slit lamp: the SL SCAN-1

“…7,[9][10][11] In addition to TD-OCT systems (Visante, Zeiss; Anterior Segment OCT, Heidelberg, Germany), a dedicated anterior segment FD OCT system is now commercially available (Casia SS-1000, Tomey Corporation, Nagoya, Japan). 12,13 Commercially available posterior segment OCT systems can also be modified to take scans of the anterior segment.…”