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The moving Dynamic Random Dot Stereosize test: development, age norms, and comparison with the Frisby, Randot, and
S J Leat1, J S Pierre, S Hassan-Abadi
1School of Optometry, University of Waterloo, Ontario, Canada.
Insights
The Moving Dynamic Random Dot Stereosize (MDRS) test is effective for assessing stereopsis in children over two years old. Visual system maturity, crucial for stereopsis, is not fully developed until ages 7-9 years.
Area of Science:
- Ophthalmology
- Developmental Neuroscience
- Pediatric Vision
Background:
- Stereopsis, the perception of depth from binocular vision, is critical for visual development.
- Assessing stereopsis in infants and young children presents unique challenges due to developmental immaturity and varying cognitive abilities.
Purpose of the Study:
- To evaluate the efficacy of the Moving Dynamic Random Dot Stereosize (MDRS) test in assessing stereopsis in infants and children.
- To gather cross-sectional, age-related data on stereopsis development using the MDRS test.
Main Methods:
- Sixty visually normal participants were stratified into four age groups (0.5-<2, 2-<5, 5-<8, and 8-<20 years).
- Stereopsis was measured using the MDRS test on two separate occasions.
- Age-appropriate tests including Frisby, Randot, or Stereo Smile were also administered.
Main Results:
- The MDRS test was successfully performed by all children over 2 years and 80% of those aged 6 months to 2 years.
- Stereopsis performance on the MDRS test demonstrated improvement with age, peaking around 9 years.
- Significant improvements were observed on the Frisby and Randot tests in children up to 7 years of age.
Conclusions:
- The findings suggest that key components of the visual system, particularly those related to stereopsis, continue to mature until 7-9 years of age.
- The MDRS test is a valuable tool for detecting visual anomalies in young children due to its demanding visual nature and cognitive simplicity.
Purpose:
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.
Conclusion:
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.