title: Validity and repeatability of a new test for aniseikonia.
abstract: OBJECTIVE
  The Aniseikonia Inspector 1.1 (AI) is a new software product to measure aniseikonia using red-green anaglyphs. The purpose of this study was to test whether the AI is a valid and reliable test.
  
  
  METHODS
  There were two groups of sample subjects: one at risk of aniseikonia, with anisometropia greater than or equal to 1.00 D (n= 29), and a control group (n= 45). The validity was studied by comparing the measured aniseikonia with the aniseikonia simulated with size lenses. The reliability was estimated by the Bland-Altman statistical method.
  
  
  RESULTS
  The results showed that the AI underestimated aniseikonia and that the underestimation was greater in the horizontal than in the vertical direction. The reliability was low, with biases that were clinically insignificant, but the 95% limits of agreement were around +/-2%. The behavior of the test was similar in both groups of subjects.
  
  
  CONCLUSIONS
  The reliability of the AI is only moderate, and professionals are therefore warned to use the results of this test with caution.
authors.affiliation: Departamento de Optica II (Optometria y Vision), Universidad Complutense, Madrid, Spain.
authors.forename: Beatriz
authors.initials: B
authors.lastname: Antona
authors.forename: Francisco
authors.initials: F
authors.lastname: Barra
authors.forename: Ana
authors.initials: A
authors.lastname: Barrio
authors.forename: Enrique
authors.initials: E
authors.lastname: Gonzalez
authors.forename: Isabel
authors.initials: I
authors.lastname: Sanchez
mesh_terms: D000328:Adult; D000839:Aniseikonia / Q000175:diagnosis*; D003936:Diagnosis, Computer-Assisted / Q000295:instrumentation; D005260:Female; D006801:Humans; D008297:Male; D015203:Reproducibility of Results; D012984:Software; D014787:Vision Tests / Q000295:instrumentation / Q000592:standards*; D015348:Vision, Binocular