title: Measurement of stereoacuity outcomes at ages 1 to 24 months: Randot Stereocards.
abstract: OBJECTIVE
  The aim of the present study was to develop a simple, quick, and portable random dot stereoacuity test for measurement of binocular sensory outcomes during the first 24 months of life.
  
  
  METHODS
  Vertical bar random dot vectographs were adapted for presentation in a "Teller Acuity Card" format, called the "Randot Stereocards." A forced-choice preferential looking protocol was used. Study participants included 386 healthy, term infants and children (normative cohort; age range: 1 month to 8 years) and 280 patients with common pediatric ophthalmic disorders (patient cohort; age range: 5 months to 9 years).
  
  
  RESULTS
  Overall, the success rate for test completion in the normative cohort was 91.3%. By 4 months of age, normal infants' mean stereoacuity was about 600'' and, by 6 months, 200''. Mean stereoacuity further improved to about 100'' by 12 months and 70'' by 18 months. Normative results were similar to published data obtained with laboratory-based stereoacuity tests. Randot Stereocard data from normal children aged 2 to 6 years were similar to published normative data for the Preschool Randot Stereoacuity Test. In the patient cohort, concordance between the Randot Stereocards and the Preschool Randot Test was 87%; concordance between the Randot Stereocards and the Randot Test was 84%.
  
  
  CONCLUSIONS
  The Randot Stereocards provide a simple, reliable, and valid method of obtaining a quantitative assessment of binocular vision in children up to 24 months of age for use in clinical trials and in clinical management.
authors.affiliation: Retina Foundation of the Southwest, Dallas, TX, USA.
authors.forename: Eileen E
authors.initials: EE
authors.lastname: Birch
authors.forename: Sarah E
authors.initials: SE
authors.lastname: Morale
authors.forename: Brett G
authors.initials: BG
authors.lastname: Jeffrey
authors.forename: Anna R
authors.initials: AR
authors.lastname: O'Connor
authors.forename: Sherry L
authors.initials: SL
authors.lastname: Fawcett
mesh_terms: D002648:Child; D002675:Child, Preschool; D015331:Cohort Studies; D003867:Depth Perception; D006801:Humans; D007223:Infant; D010468:Perceptual Disorders / Q000175:diagnosis*; D015203:Reproducibility of Results; D014787:Vision Tests / Q000295:instrumentation*; D015348:Vision, Binocular