title: Comparison of retinal nerve fiber layer and macular thickness measurements with Stratus OCT and OPKO/OTI OCT devices in healthy subjects.
abstract: OBJECTIVE
  To compare retinal nerve fiber layer (RNFL) and macular thickness measurements obtained with the Stratus optical coherence tomography (OCT) and OPKO/OTI OCT devices.
  
  
  METHODS
  Included in the study were 59 eyes of 30 participants. All measurements for each eye were done on the same day with both devices. Student's paired t-tests were used to compare the central macular thickness and RNFL measurements of the Stratus OCT and OPKO/OTI OCT. Pearson correlation was used to assess the relationship between the devices. Coefficient of variation (COV) was calculated to assess intersession repeatability.
  
  
  RESULTS
  Using both the Stratus OCT and OPKO/OTI OCT, respectively, the measured mean average RNFL thicknesses were 98.9±11.1 µm and 115.1±9.6 µm (P=0.001), and the measured mean central retinal thicknesses (CRT) were 196.2±18.8 µm and 204.5±21.1 µm (P<0.001). Measured by the two devices, the RNFL thickness values were correlated in all quadrants, as were the retinal thickness values except the inferior outer sector. COV for average RNFL and CRT thickness were 2.9% and 4.6% for Stratus OCT, and 2.1% and 4.2% for OPKO/OTI OCT, respectively.
  
  
  CONCLUSIONS
  We found good reproducibility of RNFL and retina thickness measurements for both Stratus OCT and OPKO/OTI OCT devices. However, even though the two OCT systems provided statistically correlated results, the values for both RNFL and macular thickness were statistically different. RNFL and macular thickness measurements with the OPKO/OTI OCT were higher than that of the Stratus OCT; therefore, the two OCT systems cannot be used interchangeably for the measurements of RNFL and macular thickness.
authors.affiliation: Department of Ophthalmology, Cerrahpasa School of Medicine, Istanbul University, Istanbul 34098, Turkey.
authors.forename: Ahmet
authors.initials: A
authors.lastname: Ozkok
authors.affiliation: Department of Ophthalmology, School of Medicine, Bezmialem Vakif University, Istanbul 34093, Turkey.
authors.forename: Julide Canan Umurhan
authors.initials: JC
authors.lastname: Akkan
authors.affiliation: Department of Ophthalmology, Cerrahpasa School of Medicine, Istanbul University, Istanbul 34098, Turkey.
authors.forename: Nevbahar
authors.initials: N
authors.lastname: Tamcelik
authors.affiliation: Department of Ophthalmology, Cerrahpasa School of Medicine, Istanbul University, Istanbul 34098, Turkey.
authors.forename: Mehmet
authors.initials: M
authors.lastname: Erdogan
authors.affiliation: Department of Ophthalmology, Cerrahpasa School of Medicine, Istanbul University, Istanbul 34098, Turkey.
authors.forename: Didar Ucar
authors.initials: DU
authors.lastname: Comlekoglu
authors.affiliation: Department of Ophthalmology, Cerrahpasa School of Medicine, Istanbul University, Istanbul 34098, Turkey.
authors.forename: Rengin
authors.initials: R
authors.lastname: Yildirim
keywords: OPKO/OTI OCT; Stratus optical coherence tomography; macular thickness; optical coherence tomography; retinal nerve fiber layer