Anterior Segment OCT in Primary Angle Closure Compared to Normal Subjects with Similar Shallow Anterior Chamber

2021 ◽  
Vol Publish Ahead of Print ◽  
Author(s):  
Qinghong Xie ◽  
Ping Ma ◽  
Jutima Patlidanon ◽  
Murtaza Saifee ◽  
Sean Yonamine ◽  
...  
Keyword(s):  
Anterior Chamber ◽  
Anterior Segment ◽  
Normal Subjects ◽  
Angle Closure ◽  
Anterior Segment Oct ◽  
Primary Angle Closure ◽  
Shallow Anterior Chamber

scholarly journals Anterior Segment Morphology in Primary Angle Closure Glaucoma using Ultrasound Biomicroscopy

2017 ◽  
Vol 11 (3) ◽  
pp. 86-91 ◽  
Keyword(s):  
Anterior Chamber ◽  
Anterior Segment ◽  
Anterior Chamber Depth ◽  
Normal Subjects ◽  
Ultrasound Biomicroscopy ◽  
Angle Closure Glaucoma ◽  
Angle Closure ◽  
Ciliary Process ◽  
Primary Angle Closure ◽  
Primary Angle Closure Glaucoma

ABSTRACT Aim To evaluate the configuration of the anterior chamber angle quantitatively and study the morphological changes in the eye with ultrasound biomicroscopy (UBM) in primary angle closure glaucoma (PACG) patients after laser peripheral iridotomy (LPI). Materials and methods A total of 185 eyes of 185 PACG patients post-LPI and 126 eyes of 126 normal subjects were included in this prospective study. All subjects underwent complete ophthalmic evaluation, A-scan biometry, and UBM. The anterior segment and angle parameters were measured quantitatively and compared in both groups using Student's t-test. Results The PACG patients had shorter axial length, shallower central anterior chamber depth anterior chamber depth (ACD), and anteriorly located lens when compared with normal subjects. Trabecular iris angle (TIA) was significantly narrow (5.73 ± 7.76°) in patients with PACG when compared with normal subjects (23.75 ± 9.38°). The angle opening distance at 500 μm from scleral spur (AOD 500), trabecular—ciliary process distance (TCPD), iris—ciliary process distance (ICPD), and iris—zonule distance (IZD) were significantly shorter in patients with PACG than in normal subjects (p < 0.0001). The iris lens angle (ILA), scleral—iris angle (SIA), and scleral—ciliary process angle (SCPA) were significantly narrower in patients with PACG than in normal subjects (p < 0.0001). The iris—lens contact distance (ILCD) was greater in PACG group than in normal (p = 0.001). Plateau iris was seen in 57/185 (30.8%) of the eyes. Anterior positioned ciliary processes were seen in 130/185 eyes (70.3%) of eyes. Conclusion In PACG patients, persistent apposition angle closure is common even after LPI, which could be due to anterior rotation of ciliary body and plateau iris and overcrowding of anterior segment due to shorter axial length and relative anterior lens position. How to cite this article Mansoori T, Balakrishna N. Anterior Segment Morphology in Primary Angle Closure Glaucoma using Ultrasound Biomicroscopy. J Curr Glaucoma Pract 2017;11(3):86-91.

Evaluation of anterior chamber angle under dark and light conditions in angle closure glaucoma: An anterior segment OCT study

2014 ◽  
Vol 37 (4) ◽  
pp. 300-304 ◽  
Author(s):  
Habibeh Masoodi ◽  
Ebrahim Jafarzadehpur ◽  
Alireza Esmaeili ◽  
Fereshteh Abolbashari ◽  
Seyed Mahdi Ahmadi Hosseini
Keyword(s):  
Anterior Chamber ◽  
Anterior Segment ◽  
Angle Closure Glaucoma ◽  
Angle Closure ◽  
Light Conditions ◽  
Anterior Chamber Angle ◽  
Anterior Segment Oct ◽  
Chamber Angle

scholarly journals Biometric Indicators of Anterior Segment Parameters Before and After Laser Peripheral Iridotomy by Swept-Source Optical Coherent Tomography

2021 ◽  
Author(s):  
Bo Yu ◽  
Kang Wang ◽  
Xiaoli Xing
Keyword(s):  
Anterior Chamber ◽  
Anterior Segment ◽  
Angle Closure ◽  
Laser Peripheral Iridotomy ◽  
Swept Source ◽  
Optical Coherent Tomography ◽  
Primary Angle Closure ◽  
Before And After ◽  
Anterior Segment Parameters ◽  
Peripheral Iridotomy

Abstract Background Primary angle closure glaucoma (PACG) is the most common type of glaucoma in China. Laser peripheral iridotomy (LPI) is the primary choice to treat PAC. We aim to evaluate the changes and to find the biometric indicators of anterior segment parameters before and after laser peripheral iridotomy (LPI) in primary angle closure (PAC) eyes using swept-source optical coherent tomography (OCT). Methods LPI was performed in 52 PAC eyes of 28 participants. The change of intraocular pressure and anterior segment parameters, including angle opening distance (AOD500), AOD500 area, trabecular iris space area (TISA500), TISA500 volume, trabecular iris angle (TIA500), iridotrabecular contact (ITC) index, ITC area, anterior chamber volume (ACV), anterior chamber depth (ACD), lens vault (LV) and lens thickness (LT) before and 1 week after LPI were measured by Tomey CASIA2 anterior segment OCT. We also estimate and analyze potential contributing factors possibly affecting the change of anterior chamber angle parameters. Results No post-laser complications were found. The LV and LT did not change significantly 1 week after LPI. AOD500, AOD500 area, TISA500, TISA500 volume, TIA500, ACV and ACD increased significantly after LPI. There was significant decrease in ITC index and ITC area. LT was positively correlated to the change of ITC index (r=0.411, p=0.002) and ITC area (r=0.384, p=0.005). ACD was negatively correlated to the change of ITC index (r=0.292, p=0.036). Conclusions The anterior segment architecture significantly changed after LPI in PAC spectrum eyes. Crystalline lens measurements remained unchanged before and after LPI. AS-OCT can be used to follow anterior chamber parameter changes in PAC spectrum eyes. Pre-treatment LT and ACD affect the therapeutic effect of LPI.

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