AS-OCT can be a valuable tool for the identification and sequential evaluation of patients with various anterior segment pathologies. It is especially advantageous for evaluating degrees of narrow angles and angle closure. The precision of AS-OCT can be truly exceptional if the images are acquired properly.

Optical coherence tomography (OCT) is a high resolution cross-sectional imaging modality initially developed for retinal imaging. Anterior segment OCT (ASOCT) imaging was first described in 1994 by Izatt et al using the same wavelength of light as retinal OCT, namely 830nm. This wavelength is suboptimal for imaging the angle due to limited ...

2023年1月15日 · Anterior Chamber Angle Analysis. AS-OCT can be extremely useful in assessing the anterior chamber. It is an important complement to gonioscopy and can confirm that minimally invasive glaucoma surgeries have targeted the correct anatomy.

Cirrus HD-OCT makes images of the anterior chamber angle with higher resolution than does AS-OCT devices. With the Cirrus OCT, details of the anterior chamber angle such as the scleral spur can be viewed. The Cirrus OCT may enable identification of Schwalbe's line, scleral spur, and trabecular meshwork .

2024年4月1日 · Anterior-segment OCT (AS-OCT) is more objective than gonioscopy and does not require experienced examin­ers. Although several numeric values can be attained via AS-OCT imaging, consensus on the cutoff point that defines narrow angles is lacking, and many studies of AS-OCT’s diagnostic ability are limited in design.

We then review the applications of AS-OCT for characterizing the anatomical structures of the anterior segment and aqueous outflow pathways, including the anterior chamber angle, trabecular meshwork, and Schlemm’s canal.

2012年8月1日 · Influence of pupil size on angle measurements obtained with AS-OCT; the angle is more open (21.7 ° versus 2.9 °) with a smaller pupil. Angle closure is characterized by apposition of the peripheral iris to the trabecular meshwork, resulting in …

2021年3月8日 · Anterior segment optical coherence tomography (AS-OCT) is a reliable anterior chamber angle evaluation method . The modality allows well quantifiable and highly repeatable measurements of anterior chamber angle parameters .

AS-OCT measures: angle opening distance from Schwalbe line (SL) perpendicular (AOD-SL-Perp) and vertical to iris (AOD-SL-Vert), and iridotrabecular angle (ITA). Pentacam measures: anterior chamber depth (ACD), anterior chamber volume (ACV), and anterior chamber angle (ACA). We analysed Spearman’s correlation with gonioscopic classification.

AS-OCT is the ability to use the scans to teach patients about their ocular conditions, especially those with nar-row angles or with primary angle closure (PAC), who are typically asymptomatic. Figures 1 through 5 illustrate how precisely AS-OCT is able to capture cross-sectional images of the iridocorneal angle with standardized lighting condi-