scholarly journals The Role of Anterior Segment Optical Coherence Tomography in Glaucoma

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Sarwat Salim
Keyword(s):  
Optical Coherence Tomography ◽  
Potential Role ◽  
Open Angle Glaucoma ◽  
Anterior Segment ◽  
Ultrasound Biomicroscopy ◽  
Angle Closure ◽  
Optical Coherence ◽  
Potential Benefits ◽  
Quantitative Analyses

The anterior segment optical coherence tomography provides an objective method to assess the anterior segment of the eye, including the anatomy of the anterior chamber angle. This technology allows both qualitative and quantitative analyses of the angle and has shown potential in detecting and managing angle-closure glaucoma. In addition, it has a role in identifying pathology in some forms of secondary open-angle glaucoma and postsurgical management of glaucoma. Limitations of this technology include its cost and inability to visualize well structures posterior to the iris, such as the ciliary body. This paper focuses on potential benefits and limitations of anterior segment optical coherence tomography when compared with conventional gonioscopy and ultrasound biomicroscopy. Various clinical entities will be described to discuss its potential role in glaucoma practice.

Complex visualization of the anterior segment of the eye in the diagnosis, monitoring and treatment of angle closed disease

2021 ◽  
pp. 79-83
Author(s):  
G.А. Sharova ◽  
◽  
N.I. Kurysheva ◽  
◽  
◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Anterior Segment ◽  
Ultrasound Biomicroscopy ◽  
Angle Closure ◽  
Optical Coherence ◽  
Advantages And Disadvantages ◽  
Primary Angle Closure ◽  
Primary Angle Closure Glaucoma ◽  
The Right

The aim of this work is to review the literature on the role of anterior segment imaging in the diagnosis, monitoring, and treatment of primary angle closed disease. An analysis of the use of modern technical devices – optical coherence tomography of the anterior segment (ASOST), ultrasonic biomicroscopy, Scheimpflug camera – is presented, the advantages and disadvantages in comparison with gonioscopy are assessed. Visualization of the structures of the anterior segment of the eye is an important part of the strategy aimed at solving the problem of identifying risk factors, diagnosing, monitoring and evaluating the effectiveness of treatment of diseases of primary angle closure. Qualitative and quantitative analysis of data based on optical coherence tomography, ultrasound biomicroscopy, and Scheimflug camera data confirms high comparability with gonioscopy, but each of the methods complements each other. Conclusion. Visualization of the anterior segment of the eye is the standard in modern diagnostics and evaluation of the effectiveness of treatment of primary angle closure disease. Multimodal imaging improves the ability to accurately diagnose and choose the right treatment strategy. Key words: primary angle closure, primary angle-closure glaucoma, optical coherence tomography, ultrasound biomicroscopy, Scheimflug camera, gonioscopy.

scholarly journals Changing Trends of Imaging in Angle Closure Evaluation

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Syril Dorairaj ◽  
James C. Tsai ◽  
Tomas M. Grippo
Keyword(s):  
Optical Coherence Tomography ◽  
High Resolution ◽  
Anterior Chamber ◽  
Anterior Segment ◽  
Ultrasound Biomicroscopy ◽  
Infrared Light ◽  
Angle Closure ◽  
Optical Coherence ◽  
Anterior Chamber Angle ◽  
Chamber Angle

Primary angle closure glaucoma (PACG) is a significant cause of visual disability worldwide. It predominantly affects the Eastern and South Asian population of the world. Early detection of anatomically narrow angles is important, and the subsequent prevention of visual loss from PACG depends on an accurate assessment of the anterior chamber angle (ACA). Gonioscopy has given way to modern day imaging technologies such as ultrasound biomicroscopy (UBM) and more recently, anterior segment optical coherence tomography (AS-OCT). Ultrasound biomicroscopy provides objective, high-resolution images of anterior segment anatomy, including the cornea, iris, anterior chamber, anterior chamber angle, and ciliary body. Optical coherence tomography (OCT) is a noncontact optical signal acquisition and processing device that provides magnified, high-resolution cross-sectional images of ocular tissues. Recent technological advances towards three-dimensional visualization broadened the scope of AS-OCT in ophthalmologic evaluation. Optical coherence tomography systems use low-coherence, near-infrared light to provide detailed images of anterior segment structures at resolutions exceeding that of UBM. This paper summarizes the clinical application of UBM and OCT for assessment of anterior segment in glaucoma.

Acute angle-closure glaucoma with choroidal effusion revealing a hantavirus infection: Description of ultrasound biomicroscopy imagery and optical coherence tomography Visante

2019 ◽  
pp. 112067211985889
Author(s):  
Alexandre Baillieul ◽  
Tich Ludovic Le ◽  
Jean-François Rouland
Keyword(s):  
Optical Coherence Tomography ◽  
Anterior Chamber ◽  
Anterior Segment ◽  
Ultrasound Biomicroscopy ◽  
Acute Angle ◽  
Angle Closure ◽  
Hantavirus Infection ◽  
Optical Coherence ◽  
Blurred Vision ◽  
Ciliochoroidal Effusion

Purpose: To report a case of bilateral angle-closure associated with systemic hantavirus infection. Materials and methods: A 32-year-old Caucasian man was referred with blurred vision, fever, cough, dyspnea and thrombocytopenia. Ophthalmologic examination revealed myopic shift, elevated intraocular pressure (30 mmHg right eye and 24 mmHg left eye), corneal edema, iridocorneal angle closure and shallow anterior chamber. Ciliochoroidal effusion was detected on anterior segment optical coherence tomography and ultrasound biomicroscopy. Serologic test and polymerase chain reaction confirmed the diagnosis of hantavirus infection and the serotype Puumala. On the sixth day after he started topical anti-glaucoma and cycloplegic medications, the anterior chamber and iridocorneal angles were normalized with disappearance of ciliochoroidal effusion. Conclusion: Puumala hantavirus infection is an exceptional cause of acute bilateral angle-closure combined with ciliochoroidal effusion.

scholarly journals The Role of Optical Coherence Tomography in the Diagnosis of Angle Closed Diseases of the Anterior Chamber. Part 1: Visualization of the Anterior Segment of the Eye

2021 ◽  
Vol 18 (2) ◽  
pp. 208-215
Author(s):  
N. I. Kurysheva ◽  
G. A. Sharova
Keyword(s):  
Optical Coherence Tomography ◽  
Anterior Chamber ◽  
Anterior Segment ◽  
Angle Closure ◽  
Optical Coherence ◽  
Swept Source ◽  
Primary Angle Closure ◽  
Choice Of Treatment ◽  
Closed Angle

The purpose of this work is to review the literature data on the role of optical coherence tomography in the diagnosis of diseases of the closed angle of the anterior chamber. An analysis of the modern technical devices use — optical coherence tomography of the anterior segment (AS-OST) and models with a frequency-modulated source (Swept Source) is presented. The advent of new imaging technologies such as SS-OCT is advancing the understanding of the pathogenesis of primary angle closure diseases. Visualization of the structures of the anterior segment of the eye is an important part of the strategy aimed at solving the problem of identifying risk factors, diagnosing, monitoring and evaluating the effectiveness of treatment of diseases of primary angle closure. Qualitative and quantitative data analysis based on optical coherence tomography significantly increases the diagnostic accuracy, which undoubtedly plays a key role in the choice of treatment tactics for the closed angle of the anterior chamber. The interpretation of research results should take into account the strengths and weaknesses of traditional methods and newly developed technologies.Conclusion. Optical coherence tomography of the eye’s anterior segment is a standard in modern diagnostics and evaluation of the effectiveness of treatment of diseases of primary angle closure, taking into account pathogenetic mechanisms. 

The role of anterior segment optical coherence tomography in uveitis-glaucoma-hyphema syndrome

2021 ◽  
pp. 112067212110637
Author(s):  
Myrta Lippera ◽  
Cristina Nicolosi ◽  
Lorenzo Vannozzi ◽  
Daniela Bacherini ◽  
Giulio Vicini ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Imaging Modality ◽  
Anterior Segment ◽  
Case Series ◽  
Ultrasound Biomicroscopy ◽  
Invasive Technique ◽  
Ophthalmological Examination ◽  
Optical Coherence ◽  
Retrospective Case

Purpose To describe features of uveitis-glaucoma-hyphema (UGH) syndrome, using Anterior Segment-Optical Coherence Tomography (AS-OCT) and Ultrasound Biomicroscopy (UBM) and to evaluate the diagnostic role of AS-OCT as an imaging technique alternative to UBM. Design Retrospective case series. Methods Four eyes of 4 patients with UGH syndrome were analyzed. All patients reported previous uncomplicated cataract surgery with in-the-bag implantation of single-piece-intraocular lens (IOL). They underwent at presentation complete ophthalmological examination and imaging with slit-lamp anterior segment photographs, UBM and AS-OCT. Results Although AS-OCT did not allow to visualize the structures behind the iris, it displayed a contact between IOL (plate and/or haptics) and iris and IOL tilting in 3 out of 4 eyes. AS-OCT directly detected the cause of UGH syndrome in one eye, 2 eyes required some expedients to display the iris chafing, like scans in mydriasis and/or patient's gaze direction change. AS-OCT did not allow to appreciate the IOL-iris contact (showed by UBM technique) only in one eye, probably due to the change of patient position from supine to sitting, and consequent anteriorization of iris diaphragm. Furthermore AS-OCT showed fine details, as capsular bag collapse and indirect signs of haptic malposition in 3 out of 4 eyes. Conclusion AS-OCT is a non-invasive technique that allows to determine IOL position and IOL-uveal contact in selected cases of UGH syndrome. Considering AS-OCT and UBM advantages and limitations, AS-OCT should be used as first imaging modality when clinical diagnosis is uncertain. When UGH diagnosis cannot be verified using AS-OCT, UBM should be performed.

scholarly journals The Role of Optical Coherence Tomography in the Diagnosis of Angle Closed Diseases of the Anterior Chamber. Part 2: Visualization of the Posterior Segment of the Eye

2021 ◽  
Vol 18 (3) ◽  
pp. 381-388
Author(s):  
N. I. Kurysheva ◽  
G. А. Sharova
Keyword(s):  
Optical Coherence Tomography ◽  
Anterior Chamber ◽  
Anterior Segment ◽  
Posterior Segment ◽  
Angle Closure ◽  
Eye Drops ◽  
Optical Coherence ◽  
Primary Angle Closure ◽  
Closed Angle

The purpose of this work is to review the literature data on the role of optical coherence tomography in the diagnosis of diseases of the closed angle of the anterior chamber. The analysis of the use of modern technical devices — optical coherence tomography of the posterior segment, models with a frequency-modulated source (Swept Source) is presented. The emergence of new imaging technologies such as SS-OCT contributes to understanding the pathogenesis of primary angle closure diseases in terms of involvement of the choroid in the process. A thicker choroid in the macular area may be an anatomical risk factor for closed angle disease. The expansion of an abnormally thick choroid in combination with the structural features of the anterior segment in eyes with a short axial length, including against the background of psychoemotional stress, can lead to an attack of angle closure. Visualization of the structures of the posterior segment of the eye is an important part of the strategy aimed at solving the problem of identifying risk factors, diagnosing, monitoring and evaluating the effectiveness of treatment of diseases of primary angle closure. Qualitative and quantitative data analysis based on optical coherence tomography significantly increases the diagnostic accuracy, allows to determine its progression and to predict its course. This plays a key role in the choice of treatment tactics for the anterior chamber angle closure. The review considers the effect of local antihypertensive eye drops on the choroid.Conclusion. Optical coherence tomography is a standard in modern diagnostics and evaluation of the effectiveness of treatment of diseases of primary angle closure, allowing a better understanding of the pathogenesis of the disease and its complex nature. Imaging improves the ability to accurately diagnose and choose the right treatment strategy.

Pediatric Free-floating Anterior Chamber Cyst of the Iris Pigment Epithelium

2018 ◽  
Vol 1 ◽  
pp. 3
Author(s):  
Joshua S Agranat ◽  
Yoshihiro Yonekawa
Keyword(s):  
Optical Coherence Tomography ◽  
Anterior Chamber ◽  
Incidental Finding ◽  
Pigment Epithelium ◽  
Anterior Segment ◽  
Ultrasound Biomicroscopy ◽  
Optical Coherence ◽  
Visual Axis ◽  
Associated Malignancy ◽  
Anatomic Locations

Iris pigment epithelial (IPE) cysts are a subset of iris cysts that arise from the IPE. They are spontaneously erupting epithelial-lined cavities that are found in various anatomic locations of the iris, including the iris pupillary margin, midzone, periphery, and free floating in the vitreous or anterior chamber. We report the case of an asymptomatic 13-year-old boy with an incidental finding of a dislodged anterior chamber cyst diagnosed on routine examination. Modern multimodal image analysis of the cyst including anterior segment optical coherence tomography and ultrasound biomicroscopy (UBM) was utilized to characterize the microstructural anatomy of the lesion. The patient was managed conservatively without complications. Cysts of the IPE typically do not affect vision or ocular health and can be monitored and observed after ascertaining no associated malignancy. Initial diagnostic investigation can include UBM and anterior segment optical coherence tomography. Intervention should be reserved only for cases where the cyst growth leads to obstruction of the visual axis and/or other secondary complications.

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