The moving Dynamic Random Dot Stereosize test: development, age norms, and comparison with the Frisby, Randot, and Stereo Smile tests.
OBJECTIVE
To determine the response of infants and children to the Moving Dynamic Random Dot Stereosize (MDRS) test and to collect cross-sectional age-related data.


METHODS
Sixty visually normal individuals were divided into four age groups: 0.5-<2, 2-<5, 5-<8, and 8-<20 years. Stereopsis was measured with the MDRS test on two occasions, plus the Frisby, Randot, or Stereo Smile tests, as was age appropriate.


RESULTS
All children aged >2 years and 80% of the children between ages 6 months and 2 years were able to perform the MDRS test on at least one occasion. Sixty percent of the 6-month to 2-year-old children were able to perform the Stereo Smile test on both occasions. Performance on the MDRS test improved with age up to 9 years. Improvement on the Frisby and Randot tests was seen in children aged up to 7 years. Mean and 95% confidence interval ranges for each test are given.


CONCLUSIONS
This study gives evidence that aspects of the visual system are not fully mature until age 7-9 years. The MDRS test is a visually demanding but cognitively simple test that shows potential for detecting visual anomalies in young children.
Leat
S J
SJ
School of Optometry, University of Waterloo, Ontario, Canada.
Pierre
J S
JS
Hassan-Abadi
S
S
Faubert
J
J
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D003430:Cross-Sectional Studies; D003867:Depth Perception / Q000502:physiology*; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D012016:Reference Values; D014786:Vision Disorders / Q000175:diagnosis; D015351:Vision Screening / Q000379:methods; D014787:Vision Tests / Q000379:methods / Q000592:standards*