title: Real depth vs randot stereotests.
abstract: OBJECTIVE
  To compare the performance of real depth and Randot stereotests in strabismic and nonstrabismic patients.
  
  
  METHODS
  Observational case series.
  
  
  METHODS
  Stereoacuity was tested in 182 patients with a variety of strabismic conditions, using the Frisby-Davis 2 (FD2) distance stereotest, the near Frisby (nF) (both real depth tests), the Preschool Randot (nR), and Distance Randot (dR) tests (both based on Polaroid vectographs).
  
  
  RESULTS
  Patients appreciated finer disparities with the nF test than the nR test at near and with the FD2 test than the dR test at distance.
  
  
  CONCLUSIONS
  The type of stereotest influences measurable thresholds, and the results from different tests are not interchangeable. The choice of test should depend on the question being asked; nF and FD2 would be appropriate for determining presence or absence of stereopsis and best measurable stereopsis. The more rigorous Randot tests would be appropriate for determining subtle changes.
authors.affiliation: Department of Ophthalmology, Mayo Clinic College of Medicine, Rochester, MN 55905, USA.
authors.forename: David A
authors.initials: DA
authors.lastname: Leske
authors.forename: Eileen E
authors.initials: EE
authors.lastname: Birch
authors.forename: Jonathan M
authors.initials: JM
authors.lastname: Holmes
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D002675:Child, Preschool; D003867:Depth Perception / Q000502:physiology*; D006801:Humans; D008875:Middle Aged; D013285:Strabismus / Q000503:physiopathology*; D014787:Vision Tests; D015348:Vision, Binocular / Q000502:physiology*; D014792:Visual Acuity / Q000502:physiology