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Volumetric parameters-based differentiation of narrow angle from open angle and classification of angle configurations: an SS-OCT study
  1. Fei Li,
  2. Rouxi Zhou,
  3. Kai Gao,
  4. Ling Jin,
  5. Xiulan Zhang
  1. State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou 510060, China
  1. Correspondence to Professor Xiulan Zhang, Zhongshan Ophthalmic Center, Guangzhou 510060, China; zhangxl2{at}


Background To evaluate the diagnostic ability of volumetric parameters to differentiate narrow angle from open angle and distinguish different configurations of narrow angle.

Methods The current study was composed of two parts. In the first part, with gonioscopy as reference standard, we tested power of each parameter to differentiate narrow angle from open angle. In the second part, we evaluated the efficacy of different parameters to distinguish angle configurations which were subclassified into type 1 (pupillary block) and type 2 (non-pupillary block and multiple mechanisms) based on ultrasound biomicroscopy (UBM) images.

Results In part 1, the training set was composed of 117 narrow-angle eyes and 60 open-angle eyes, and the validation set included 38 narrow-angle eyes and 37 open-angle eyes. Anterior chamber volume (ACV) outperformed all the other parameters with an area under the curve (AUC) of 0.988. The sensitivity and specificity of the cut-off value 98.1 mm3 in the validation set were 90.0% and 97.1%, respectively. In part 2, training set was composed of 96 eyes of 88 patients with primary angle-closure disease, with 49 diagnosed as type 1 and 47 as type 2 configuration. 32 eyes were used for validation. A model comprised of iris volume (IV), iris thickness (IT) 2000 µm from the scleral spur and angle open distance (AOD) 750 µm from the scleral spur was found to have an AUC of 0.793 (95% CI, 0.695 to 0.870). Sensitivity and specificity of the model were 82.6% and 77.8% respectively in the validation set.

Conclusions With ACV, we can detect patients with narrow angle from open angle faster and more easily than AOD and anterior chamber depth. Then, for patients with narrow angle, the combination of IV, IT and AOD750 measured by swept-source optical coherence tomography could further classify configurations of angle closure compared with UBM.

  • glaucoma
  • anterior chamber
  • swept-source OCT

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  • FL and RZ are joint first authors.

  • Contributors FL and XZ: study design. FL, RZ and KG: data collection and measurement. FL, RZ and LJ: statistical analysis. FL, RZ and XZ wrote the manuscript.

  • Funding The study was funded by National Key R&D Program of China (2018YFC0116500), the Science and Technology Program of Guangzhou, China (201803010066) and the Fundamental Research Funds of the State Key Laboratory of Ophthalmology.

  • Competing interests None declared.

  • Patient consent for publication Obtained.

  • Provenance and peer review Not commissioned; externally peer reviewed.

  • Data sharing statement No additional data is available from the study.

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