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Testing stereopsis in the preschool child: is it clinically useful?
R E Manny1, A T Martinez, K D Fern
1University of Houston, College of Optometry, Tex. 77204-6052.
Journal of Pediatric Ophthalmology and Strabismus
|July 1, 1991
Summary
Assessing stereopsis in young children using tests like the Lang and Frisby stereotests can reliably indicate normal binocular vision. These tests effectively evaluate binocular function without needing to determine precise stereothresholds.
Area of Science:
- Ophthalmology
- Pediatric Vision
- Neuroscience
Background:
- Evaluating binocular function in infants and young children is crucial.
- Clinical stereopsis tests often yield poorer thresholds in children than expected for normal vision.
Purpose of the Study:
- To determine if large stereothresholds on pediatric tests indicate normal binocular function.
- To investigate the diagnostic value of stereotests in preschool children.
Main Methods:
- Experiment 1: Assessed monocular cue salience in normal preschoolers (2-5 years) using Lang and Frisby stereotests.
- Experiment 2: Tested preschoolers with abnormal binocular vision (strabismus, anisometropia) on Lang and Frisby stereotests.
Main Results:
- No normal preschoolers passed the tests monocularly, confirming binocular cue reliance.
- Children with strabismus failed both tests; some with anisometropia passed.
- Passing the Frisby (730 arcsec) or Lang (733/800 arcsec) tests suggests normal binocular function in preschoolers.
Conclusions:
- The Lang and Frisby stereotests, demonstrating gross stereopsis, are indicative of normal binocular function in preschool children.
- These clinical tests provide evidence of binocular function without requiring measurement of fine stereothresholds.