title: Reliability of the first eye and second eye in frequency doubling technology perimetry.
abstract: OBJECTIVE
  To compare the reliability of the perimetry results of the first eye and the second eye with frequency doubling technology (FDT).
  
  
  METHODS
  The subjects were 328 residents who underwent the C-20-5 mode of FDT at a city in central Japan. FDT perimetry was always performed first in the right eye and then in the left eye without any time between tests. When more than 33% fixation loss or false-positive error was detected, the result was judged unreliable.
  
  
  RESULTS
  Of the 328 subjects, the bilateral perimetry results were reliable in 255 subjects (77.7%), the unilateral results were reliable in 57 (17.4%), and there was not a reliable result in either eye in 16 (4.9%) subjects. Of the 57 subjects whose unilateral result was unreliable, the result of the second eye was unreliable in 50 (88%) subjects, and the result of the first eye was unreliable in 7 (12%). This difference in the reliability between the first eye and second eye was significant (P < 0.001). There were no differences in the age, sex, visual acuity, refractive error, test duration, or number of glaucoma suspects between the two groups whose unilateral result was unreliable in the first eye or the second eye.
  
  
  CONCLUSIONS
  The FDT perimetry result of the second eye was less reliable than that of the first eye.
authors.affiliation: Department of Ophthalmology and Visual Sciences, Hiroshima University Graduate School of Biomedical Sciences, Hiroshima, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Mukai
authors.forename: Hidetoshi
authors.initials: H
authors.lastname: Tsukamoto
authors.forename: Aiko
authors.initials: A
authors.lastname: Iwase
authors.forename: Hiromu K
authors.initials: HK
authors.lastname: Mishima
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005189:False Positive Reactions; D005260:Female; D005403:Fixation, Ocular; D006801:Humans; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D015203:Reproducibility of Results; D058609:Visual Field Tests / Q000379:methods / Q000592:standards*; D014794:Visual Fields