Anterior Chamber Angle Assessment Techniques

Campa, Claudio; Pierro, Luisa; Bettin, Paolo; Bandello, Francesco

doi:10.5772/19617

Cited by 4 publications

(3 citation statements)

References 60 publications

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“…However, the refraction affects the apparent position of CB on iris in cornea. These refracted height yr and angle αr approximated using paraxial ray tracing geometric optics in et al [24] through refractive bodies with refractive indices n1, n2, curvature radius R, ray height y, ray angle of α and thickness of t shown in equation (5), (6).…”

Section: A Ld Role In Acd Measurementmentioning

confidence: 99%

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Parameterization of Limbus Distance in Van Herick method's angle closure glaucoma diagnosis

Ardakani

Kongprawechnon

Theeramunkong

et al. 2016

2016 7th International Conference of Information and Communication Technology for Embedded Systems (IC-ICTES)

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As a non-invasive angle closure glaucoma diagnosis procedure, Van Herick's slit-lamp Limbal Anterior Chamber Depth Estimation (LACDE) technique is preferably the current standard screening method preliminarily performed at hospitals and eye clinics. However, accuracy of depth estimation is very much dependent on the slit projection distance from the limbus (LD). This study investigated the relation and designed a parametric model to reduce the inconsistencies between results and improving the Van Herick's method accuracy. Additionally, two different types of classifiers such as Support Vector Machine (SVM) andDecision Tree with addition of LD as a predictor were trained and tested for comparison with parametric model. In the end acquired results clearly showed the effectiveness of LD consideration in LACDE, which lead to improvement in the experimental results.

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Section: A Ld Role In Acd Measurementmentioning

confidence: 99%

“…In fact, VH is counted as a surrogate method for screening of ACG and narrow ACA [6,7,8]. It is worth mentioning that there was a contradictory results achieved by Thomas et al [9] and a study by Sakata et al [10] voiced in favor of AS-OCT.…”

Section: Introductionmentioning

confidence: 99%

Parameterization of Limbus Distance in Van Herick method's angle closure glaucoma diagnosis

Ardakani

Kongprawechnon

Theeramunkong

et al. 2016

2016 7th International Conference of Information and Communication Technology for Embedded Systems (IC-ICTES)

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“…6 No study has analyzed the space between the iris and the cornea to determine which device should be used in a specific patient. Although gonioscopy is the current gold standard for assessing the ACA, 7 AS-OCT has also been widely used due to recent advancements and new features made for ACA assessment. This study was designed to evaluate an AS-OCT method that is different and simpler than other assessments.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Iridocorneal Angle Assessments in Open-Angle Glaucoma and Ocular Hypertension Patients: Anterior Segment Optical Coherence Tomography and Gonioscopy

Craven¹,

Chopra²,

Goldberg³

et al. 2022

OPTH

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Purpose To quantitatively compare iridocorneal angle assessments using gonioscopy and anterior segment optical coherence tomography (AS-OCT). Patients US and Chinese patients with open-angle glaucoma (OAG) and/or ocular hypertension (OHT). Methods Analysis was pooled from 2 multicenter, noninterventional studies conducted in the US and China. Gonioscopy Shaffer grade and an AS-OCT method that approximates the angle width relative to local morphologic variations were compared by measuring the same iridocorneal angles. A third, separate, single-center, noninterventional study was conducted to verify results observed from the pooled analysis. Results From the pooled studies, a total of 239 eyes were measured using Shaffer grade and AS-OCT. Of these, 6 were Shaffer grade 2, 37 in Shaffer grade 3, and 196 in Shaffer grade 4. There was a trend of increasing Shaffer grade with increasing AS-OCT angle width. Open iridocorneal angles, Shaffer grade ≥3, had a ~98% sensitivity and 88% positive predictive value for identifying AS-OCT angle width ≥300 µm, using the AS-OCT method. To verify these results, a total of 28 right eyes were imaged for the third study. A trend of increasing Shaffer grade with increasing AS-OCT angle width was observed, and angles with Shaffer grade ≤2 had AS-OCT angle width <300 µm. Conclusion The AS-OCT method can determine the space in the anterior chamber and can potentially identify angles that are the appropriate size for certain glaucoma devices. Information gathered from AS-OCT can provide additional comprehensive and quantitative assessment to gonioscopy.

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Ophthalmology national normative database series (2): Gonioscopic character of the normal anterior chamber angle in sudanese adults

Fadlallah¹,

Saleem

2017

Albasar Int J Ophthalmol

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Anterior Chamber Angle Assessment Techniques

Cited by 4 publications

References 60 publications

Parameterization of Limbus Distance in Van Herick method's angle closure glaucoma diagnosis

Parameterization of Limbus Distance in Van Herick method's angle closure glaucoma diagnosis

Comparison of Iridocorneal Angle Assessments in Open-Angle Glaucoma and Ocular Hypertension Patients: Anterior Segment Optical Coherence Tomography and Gonioscopy

Ophthalmology national normative database series (2): Gonioscopic character of the normal anterior chamber angle in sudanese adults

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