Crowding Ratio in Young Normally Sighted Children
| Autor: | Gerard C. de Wit, Florine Pilon, Maria M. van Genderen, Marjoke J. Dekker, Mieke M. C. Bijveld |
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| Rok vydání: | 2012 |
| Předmět: |
Male
medicine.medical_specialty genetic structures Visual impairment Vision Disorders Visual Acuity Normal values Audiology Developmental psychology Near vision Reference Values Cerebral visual impairment medicine Humans Child Perceptual Distortion Vision Binocular Vision Tests Crowding Form Perception Ophthalmology Child Preschool Sensory Thresholds Female medicine.symptom Psychology |
| Zdroj: | Strabismus. 20:49-54 |
| ISSN: | 1744-5132 0927-3972 |
| DOI: | 10.3109/09273972.2012.680233 |
| Popis: | To determine normal values of the crowding ratio (CR) in children.Of 62 normally sighted primary school children aged 4-12 years old the CR was determined both for distance and near vision. The examinations were performed using commonly available test charts based on the LEA symbols.At near, the CR was significantly better than at distance and for all ages2.0. The upper limit of the CR at distance was2.0 from age six.With commonly available tests the CR can easily be determined in school age children. For children6 years of age, a CR2.0 (i.e. at least 3 lines difference between the result of a single optotype acuity test and a line acuity test) is suspicious and warrants further investigation. It may, for example, be a sign of cerebral visual impairment (CVI). |
| Databáze: | OpenAIRE |
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