Evaluation of methods for assessing visual function of infants
| Autor: | William C. Heird, Yali L. Zou, Thomas C. Prager, Craig L. Jensen, J. Kennard Fraley, Robert E. Anderson |
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| Rok vydání: | 1999 |
| Předmět: |
Male
medicine.medical_specialty Aging Visual acuity genetic structures Population Visual Physiology Visual Acuity Audiology Medicine Humans Evoked potential education education.field_of_study Communication business.industry Vision Tests Infant Reproducibility of Results Ophthalmology Visual function Pediatrics Perinatology and Child Health Evoked Potentials Visual Electrical testing Female medicine.symptom business |
| Zdroj: | Journal of AAPOS : the official publication of the American Association for Pediatric Ophthalmology and Strabismus. 3(5) |
| ISSN: | 1091-8531 |
| Popis: | Purpose: Commonly used behavioral and electrical testing methods for estimation of visual acuity and visual function in infants yield different estimates and may not accurately predict visual acuity and visual function in later life. Moreover, neither test-retest variability nor side-by-side comparisons of the various methods have been thoroughly evaluated in the same infant population. The purpose of this study was to provide such an evaluation. Method: The test-retest variability of visual acuity and visual function was evaluated for the Teller Acuity Card (TAC) procedure, sweep visual evoked potential (VEP), as well as latency and amplitude measured by transient pattern VEP. Groups of approximately 20 infants contributed test-retest data. Visual function estimated by the various methods in a larger group of infants (n = 118) was compared. Correlations between methods and the validity of the various methods to detect maturational changes between 4 and 8 months of age were also assessed. Administration of these tests was according to standard and usual procedures. Results: The average percent difference between test and retest estimates of acuity as well as the SD was lowest for transient VEP latency (3%, 7% SD). The other methods were markedly more variable: sweep VEP (2%, 22% SD), TAC procedure (8%, 20% SD), and transient VEP amplitude (7.5%, 39% SD). Average coefficients of variation showed a similar trend: transient VEP latency, 8%; sweep VEP, 15%; TACs, 30%; and transient amplitude, 53%. Correlations among estimates by the methods were poor, but expected changes in visual maturation from 4 to 8 months of age were detected with all methods. Conclusions: All methods evaluated provide valid and reliable test-retest data for a group, but are less valid for estimating visual acuity and visual function of an individual subject. The poor correlations between any 2 of the testing methods suggest that each test assesses a different aspect of vision. Nonetheless, expected maturational changes between 4 and 8 months of age were readily detectable by all methods evaluated. (J AAPOS 1999;3:275-82) |
| Databáze: | OpenAIRE |
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