Clinical Ophthalmology (Apr 2022)
Comparison of Iridocorneal Angle Assessments in Open-Angle Glaucoma and Ocular Hypertension Patients: Anterior Segment Optical Coherence Tomography and Gonioscopy
Abstract
E Randy Craven,1 Vikas Chopra,2 Jeffrey L Goldberg,3 Kenneth M Marion,4 Xiaoming Chen,5 Cheng-Tao Chang,6 Michelle Y Chen6 1Johns Hopkins University School of Medicine, Baltimore, MD, USA; 2Doheny Eye Center UCLA, Pasadena, CA, USA; 3Byers Eye Institute at Stanford University, Palo Alto, CA, USA; 4Doheny Eye Institute, Los Angeles, CA, USA; 5West China Hospital Sichuan University, Sichuan, People’s Republic of China; 6Allergan, an AbbVie Company, Irvine, CA, USACorrespondence: E Randy Craven, 600 N. Wolfe Street, Baltimore, MD, 21287, USA, Tel +1 240-482-1100, Fax +1 240-482-1105, Email [email protected]: 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.Keywords: gonioscopy, anterior segment optical coherence tomography, angle assessment, open-angle glaucoma
