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An evaluation of techniques for measuring stereopsis in infants and young children
1Visual Assessment Unit, UWCC, Cardiff, UK.
Insights
Assessing stereopsis in young children is crucial for detecting vision problems. Different stereotests suit various age groups, with tolerance for red/green glasses being a key factor in test selection.
Area of Science:
- Ophthalmology
- Pediatric Vision Screening
- Stereopsis Assessment
Background:
- Stereopsis is vital for identifying profound visual deficits in infants and toddlers.
- Early detection of visual impairments can significantly impact developmental outcomes.
- Clinical assessment of stereopsis in very young children presents unique challenges.
Purpose of the Study:
- To evaluate the performance of three clinically available stereotests (Lang, Frisby, TNO) and a computerized dynamic random dot stereogram in infants and young children.
- To compare the efficacy of these stereotests across different age groups, particularly focusing on those under three years old.
- To determine the most appropriate stereotest for specific age ranges based on performance and tolerability.
Main Methods:
- A cohort of 55 infants and young children (10 under 1 year) were tested using the Lang, Frisby, and TNO stereotests.
- Performance was compared against a computerized dynamic random dot stereogram.
- Data analysis focused on pass rates across different age brackets and test types.
Main Results:
- Lang test: 74% pass rate (50% for infants under 1 year).
- Frisby test: 65% pass rate (20% for infants under 1 year).
- TNO test: 49% pass rate (no infants under 1 year).
- Computerized stereogram: 42.5% pass rate overall (100% for those over 3 years).
- Both TNO and computerized stereogram showed difficulties in infants aged 8 months to 2 years due to red/green glasses rejection.
Conclusions:
- The choice of stereotest for infants and toddlers should consider their ability to tolerate red/green glasses.
- Recommended age-specific testing: dynamic random dot test (under 8 months), Lang or Frisby (8-30 months), TNO or dynamic random dot stereogram (over 30 months).
- Stereopsis assessment is feasible in young children, but test selection requires careful age and tolerance considerations.
Abstract:
Demonstrating stereopsis is valuable in vision screening of infants and toddlers, since its presence rules out the possibility of profound visual deficits. We assessed the performance of 55 infants and young children on three clinically available tests, the Lang, the Frisby and the TNO. The results were compared with those found using a computerized dynamic random dot stereogram. Most of the children tested were under 3 years of age and 10 were aged under 1 year. The Lang test was passed by 74%, including 50% of those under 1 year. The Frisby test was passed by 65%, but by only 20% of infants under 1 year. Forty-nine per cent passed the TNO test; none were under 1 year. The computerized stereogram was passed by 42.5% of those tested, including 100% of those over 3 years old. Both this test and the TNO presented difficulty in testing infants between 8 months and 2 years because of the increased likelihood that these children would reject the red/green glasses. We recommend that the most appropriate stereotest is largely based on whether the child will tolerate red/green glasses. We would use the dynamic random dot test for infants under 8 months of age, the Lang or Frisby stereotest for infants from 8 months to 30 months, and the TNO or dynamic random dot stereogram after this age.