title: Repeatability and reproducibility of anterior chamber volume measurements using 3-dimensional corneal and anterior segment optical coherence tomography.
abstract: OBJECTIVE
  To evaluate the repeatability and reproducibility of anterior chamber volume (ACV) measurements using swept-source 3-dimensional corneal and anterior segment optical coherence tomography (CAS-OCT) and dual Scheimpflug imaging.
  
  
  METHODS
  Department of Ophthalmology, Institute of Clinical Medicine, University of Tsukuba, Ibaraki, Japan.
  
  
  METHODS
  Nonrandomized clinical trial.
  
  
  METHODS
  Measurements were taken in normal eyes (subject group) and in eyes with primary angle closure (PAC) (patient group). In the subject group, the entire ACV and the central 8.0 mm diameter ACV were measured using CAS-OCT and dual Scheimpflug imaging. In the patient group, the entire ACV and 8.0 mm ACV were measured using CAS-OCT. The coefficient of variation and intraclass correlation coefficient (ICC) were calculated to evaluate repeatability and reproducibility, and the correlation between the 2 devices was assessed.
  
  
  RESULTS
  In the subject group, the mean 8.0 mm ACV was 110.14 mm(3) ± 12.57 (SD) using CAS-OCT and 114.51 ± 14.69 mm(3) using Scheimpflug imaging; there was a significant linear correlation (r = 0.878, P < .0001). The mean entire ACV on CAS-OCT was 165.15 ± 29.29 mm(3). The ICCs of the 8.0 mm and entire ACV measurements were greater than 0.94. The coefficients of repeatability and reproducibility of the 8.0 mm ACV and entire ACV measurements were less than 5%. In the patient group, the 8.0 mm and entire ACV measurements showed good reproducibility and repeatability.
  
  
  CONCLUSIONS
  The CAS-OCT method allowed noninvasive measurement of the entire ACV with sufficient repeatability and reproducibility. The 8.0 mm ACV measurements with CAS-OCT and Scheimpflug imaging were comparable.
authors.affiliation: Department of Ophthalmology, University of Tsukuba, Ibaraki, Japan. caesar.shihtzu@gmail.com
authors.forename: Shinichi
authors.initials: S
authors.lastname: Fukuda
authors.forename: Keisuke
authors.initials: K
authors.lastname: Kawana
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Yasuno
authors.forename: Tetsuro
authors.initials: T
authors.lastname: Oshika
mesh_terms: D000328:Adult; D000867:Anterior Chamber / Q000473:pathology*; D000869:Anterior Eye Segment / Q000033:anatomy & histology; D001699:Biometry; D003315:Cornea / Q000033:anatomy & histology; D005260:Female; D015812:Glaucoma, Angle-Closure / Q000473:pathology; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods; D008297:Male; D008875:Middle Aged; D010781:Photography / Q000295:instrumentation; D015203:Reproducibility of Results; D041623:Tomography, Optical Coherence / Q000295:instrumentation*