title: Biometry measurements using a new large-coherence-length swept-source optical coherence tomographer.
abstract: OBJECTIVE
  To evaluate the repeatability and reproducibility of the measurements obtained with the Argos, a new biometer with swept-source optical coherence tomography (SS-OCT), and to compare them with the results obtained with the IOLMaster 500 (partial-coherence interferometry [PCI]) and the Lenstar LS 900 (optical low-coherence reflectometry [OLCR]) biometers.
  
  
  METHODS
  Private practice, Lynwood, California, USA.
  
  
  METHODS
  Prospective observational study.
  
  
  METHODS
  All measurements were performed with the SS-OCT tomographer, the PCI biometer, and the OLCR biometer.
  
  
  RESULTS
  Eyes (n = 107) were measured to evaluate the axial length (AL), central corneal thickness (CCT), aqueous depth, anterior chamber depth (ACD), lens thickness, pupil size, corneal diameter, and anterior corneal radius of curvature (RAV). Repeatability and reproducibility of the SS-OCT measurements showed comparable values and a low variation rate, with an interset mean difference of 0.01 mm for AL, 0.01 mm for CCT, 0.01 mm for aqueous depth and ACD, 0.03 mm for lens thickness, 0.10 mm for pupil size, 0.14 mm for corneal diameter, and 0.02 mm for RAV. The SS-OCT device correctly measured the AL in 96% of the cases compared with 79% for the OLCR device and 77% for the PCI device. Comparisons between the PCI device and SS-OCT device were -0.01 ± 0.05 mm for AL, -0.17 ± 0.20 mm for ACD, and -0.01 ± 0.05 mm for RAV. Comparison between the OLCR device and the SS-OCT device was 0.01 ± 0.06 mm for AL, 0.08 ± 0.15 mm for ACD, 0.00 ± 0.05 mm for RAV, 0.00 ± 0.01 mm for CCT, 0.07 ± 0.14 mm for aqueous depth, -0.23 ± 0.22 mm for lens thickness, -0.29 ± 0.53 mm for pupil size, and -0.34 ± 0.76 mm for corneal diameter.
  
  
  CONCLUSIONS
  Axial length measurements with the new SS-OCT biometer were comparable to the PCI and OLCR measurements with a higher AL acquisition rate.
  
  
  BACKGROUND
  Dr. Shammas is a consultant to Movu, Inc. Drs. Ortiz, Kim, and Chong have proprietary interest in the new technology.
authors.affiliation: From the Department of Ophthalmology (H.J. Shammas), The Keck School of Medicine of the University of Southern California Los Angeles, the Shammas Eye Medical Center (H.J. Shammas, M.C. Shammas), Lynwood, and Movu, Inc. (Ortiz, Kim, Chong), San Jose, California, USA. Electronic address: jshammas@shammaseye.com.
authors.forename: H John
authors.initials: HJ
authors.lastname: Shammas
authors.affiliation: From the Department of Ophthalmology (H.J. Shammas), The Keck School of Medicine of the University of Southern California Los Angeles, the Shammas Eye Medical Center (H.J. Shammas, M.C. Shammas), Lynwood, and Movu, Inc. (Ortiz, Kim, Chong), San Jose, California, USA.
authors.forename: Sergio
authors.initials: S
authors.lastname: Ortiz
authors.affiliation: From the Department of Ophthalmology (H.J. Shammas), The Keck School of Medicine of the University of Southern California Los Angeles, the Shammas Eye Medical Center (H.J. Shammas, M.C. Shammas), Lynwood, and Movu, Inc. (Ortiz, Kim, Chong), San Jose, California, USA.
authors.forename: Maya C
authors.initials: MC
authors.lastname: Shammas
authors.affiliation: From the Department of Ophthalmology (H.J. Shammas), The Keck School of Medicine of the University of Southern California Los Angeles, the Shammas Eye Medical Center (H.J. Shammas, M.C. Shammas), Lynwood, and Movu, Inc. (Ortiz, Kim, Chong), San Jose, California, USA.
authors.forename: Seong Hwan
authors.initials: SH
authors.lastname: Kim
authors.affiliation: From the Department of Ophthalmology (H.J. Shammas), The Keck School of Medicine of the University of Southern California Los Angeles, the Shammas Eye Medical Center (H.J. Shammas, M.C. Shammas), Lynwood, and Movu, Inc. (Ortiz, Kim, Chong), San Jose, California, USA.
authors.forename: Changho
authors.initials: C
authors.lastname: Chong
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000867:Anterior Chamber / Q000473:pathology; D058452:Axial Length, Eye / Q000473:pathology*; D001699:Biometry / Q000295:instrumentation*; D002386:Cataract / Q000150:complications; D003315:Cornea / Q000473:pathology*; D005260:Female; D006801:Humans; D007368:Interferometry; D007908:Lens, Crystalline / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009929:Organ Size; D011446:Prospective Studies; D011680:Pupil / Q000502:physiology; D015203:Reproducibility of Results; D041623:Tomography, Optical Coherence / Q000295:instrumentation*