title: Variability of rarebit and standard perimetry sizes I and III in normals.
abstract: OBJECTIVE
  To compare test-retest variability in rarebit perimetry (RBP) and conventional standard automated perimetry (SAP) using Goldmann size I and III stimuli.
  
  
  METHODS
  Seventeen normal subjects underwent RBP, size I SAP, and size III SAP on five separate visits within a 5-week period. Test-retest variability could not be directly compared because of differences in units. Instead, data were transformed to lie on the same scale by calculating a percentile range to mean ratio for each test.
  
  
  RESULTS
  Percentile range to mean ratio was highest for size I (3.42 ± 0.62), followed by size III (2.29 ± 0.55), and RBP (0.29 ± 0.10). Results for all three tests were significantly different from each other.
  
  
  CONCLUSIONS
  Comparison of tests with different scales is problematic, but RBP's retest variability appears to be significantly less than both sizes I and III SAP in the measurement of normal subjects.
authors.affiliation: Department of Ophthalmology and Neurology, University of Iowa, College of Medicine, Iowa City, IA, USA.
authors.forename: Jesse M
authors.initials: JM
authors.lastname: Vislisel
authors.forename: Carrie K
authors.initials: CK
authors.lastname: Doyle
authors.forename: Chris A
authors.initials: CA
authors.lastname: Johnson
authors.forename: Michael
authors.initials: M
authors.lastname: Wall
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012016:Reference Values; D015203:Reproducibility of Results; D058609:Visual Field Tests / Q000379:methods*; D055815:Young Adult