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Near stereoacuity: development in preschool children; normative values and screening for binocular vision
Insights
The TNO Stereotest reliably screens for binocular vision issues and amblyopia in children. Stereoacuity significantly improves between ages 4 and 5 1/2, reaching adult levels by 5 1/2.
Area of Science:
- Ophthalmology
- Pediatric Vision
- Visual Development
Background:
- Stereoacuity development in children with normal binocular vision has yielded controversial results.
- Reliability of stereoscopic tests for screening abnormal binocular vision and amblyopia requires further investigation.
Purpose of the Study:
- To evaluate stereoacuity development in children with normal binocular vision.
- To assess the reliability of stereoscopic tests for screening binocular vision anomalies and amblyopia.
Main Methods:
- Prospective study of 115 children aged 3 to 6 1/2 years.
- Children were tested using TNO and Titmus Stereotests.
- Comprehensive eye examinations were conducted to identify ocular and vision abnormalities.
Main Results:
- Binocular vision anomalies were identified in 3 out of 115 children via stereotesting.
- The TNO Stereotest demonstrated better testability compared to the Titmus Stereotest.
- Significant age-related improvement in stereoacuity was observed with the TNO Test (p=.0001), but not the Titmus Stereotest Circles (p=.045).
Conclusions:
- The TNO Test is a reliable tool for screening binocular vision anomalies and amblyopia.
- Normal stereopsis and stereoacuity significantly improve between 4 and 5 1/2 years of age.
- Adult-like stereoacuity levels are achieved by 5 1/2 years of age on the TNO Test.
Purpose:
Because of controversial results in previous reports, we wished to further evaluate stereoacuity development in children with normal binocular vision, and to investigate the reliability of stereoscopic tests for screening for abnormal binocular vision and amblyopia.
Materials And Methods:
In a prospective study, 115 children, age 3 to 6 1/2 years, were first tested on the TNO and Titmus Stereotests, after which they received a more complete eye examination to determine the presence of ocular and vision abnormalities. Only specific quantitative stereotest results were tabulated for the development study.
Results:
Binocular vision anomalies were detected by stereotesting in 3 of the 115 children. Testability was better on the TNO than the Titmus Stereotest. Using only the quantitative stereotest results, when segregated by age groups, there was a "statistically significant" change (improvement with age) on the TNO Test (p=.0001)(x2); whereas there was no such improvement found on the Titmus Stereotest Circles, p=.045, 0.72.
Conclusions:
The TNO Test is reliable for screening for binocular vision anomalies and amblyopia. Also, normal stereopsis and stereoacuity acuity improves "significantly" between age 4 and 5 1/2 years, and reaches adult-like level at 5 1/2 years on this test.
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