title: Fixation Stability Measurement Using Two Types of Microperimetry Devices.
abstract: OBJECTIVE
  We compared the fixation stability measurements obtained with two microperimeters, the Micro Perimeter 1 (MP-1) and the Spectral OCT/SLO (OCT/SLO), in subjects with and without maculopathies.
  
  
  METHODS
  A total of 41 eyes with no known ocular diseases and 45 eyes with maculopathies were enrolled in the study. Both eyes of each participant had a 20-second fixation test using the MP-1 and OCT/SLO. The bivariate contour ellipse area (BCEA) was used for fixation stability evaluation.
  
  
  RESULTS
  In the normal group, BCEA was 2.93 ± 0.32 log minarc2on OCT/SLO and 2.89 ± 0.30 log minarc2on MP-1. In the maculopathy group, BCEA was 3.05 ± 0.41 log minarc2on OCT/SLO and 3.15 ± 0.46 log minarc2on MP-1. There was no statistically significant difference between the BCEA measured by OCT/SLO and by MP-1 in both groups. A moderate correlation was found between the two devices (r= 0.45,P< 0.001). The sample size during the fixation test was 535.5 ± 14.6 pairs of coordinates in the normal group and 530.7 ± 14.9 pairs in the maculopathy group with MP-1, while it was 72.3 ± 6.9 and 59.9 ± 10.1, respectively, with OCT/SLO. This was due to different tracking frequencies between the two microperimeters.
  
  
  CONCLUSIONS
  Fixation stability assessment yields similar results using the OCT/SLO and MP-1. A major difference in sampling rate between the two microperimeters does not significantly affect BCEA measurements.
  
  
  CONCLUSIONS
  Fixation stability assessments are comparable and interchangeable between the OCT/SLO and the MP-1.
authors.affiliation: Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland, USA ; Visual Science and Optometry Center, People's Hospital of Guangxi Zhuang Autonomous Region, Nanning, Guangxi Province, China.
authors.forename: Hongting
authors.initials: H
authors.lastname: Liu
authors.affiliation: Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland, USA.
authors.forename: Millena G
authors.initials: MG
authors.lastname: Bittencourt
authors.affiliation: Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland, USA.
authors.forename: Raafay
authors.initials: R
authors.lastname: Sophie
authors.affiliation: Truhlsen Eye Institute, University of Nebraska Medical Center, Omaha, Nebraska, USA.
authors.forename: Yasir J
authors.initials: YJ
authors.lastname: Sepah
authors.affiliation: Truhlsen Eye Institute, University of Nebraska Medical Center, Omaha, Nebraska, USA.
authors.forename: Mostafa
authors.initials: M
authors.lastname: Hanout
authors.affiliation: Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland, USA.
authors.forename: Zubir
authors.initials: Z
authors.lastname: Rentiya
authors.affiliation: Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland, USA.
authors.forename: Rachel
authors.initials: R
authors.lastname: Annam
authors.affiliation: Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland, USA.
authors.forename: Hendrik P N
authors.initials: HP
authors.lastname: Scholl
authors.affiliation: Truhlsen Eye Institute, University of Nebraska Medical Center, Omaha, Nebraska, USA.
authors.forename: Quan Dong
authors.initials: QD
authors.lastname: Nguyen
keywords: comparison; fixation stability; microperimetry