Journal of pediatric ophthalmology and strabismus · 1996
The range and variability of ophthalmological parameters in normal children aged 4 1/2 to 5 1/2 years.
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Lam S R, LaRoche G R, De Becker I, Macpherson H
Аннотация
BACKGROUND: Some standards for childhood ophthalmological variables exist. However, for most parameters, the range of variation found in normal children remains poorly defined.
METHODS: We have determined the range of normal function for a number of commonly measured ophthalmological variables in 162 children, classified normal by Gold Standard ophthalmological examination. This group is representative of almost 12,000 normal children aged 4 1/2 to 5 1/2 in Nova Scotia.
RESULTS: In 56.8% of eyes the visual acuity was 6/4.5. The use of a chart with crowding bars was more discriminating between differences in higher levels of acuity and highlighted differences in acuity between the two eyes. Randot stereoacuity showed a uniform, non-Gaussian distribution of scores. Cycloplegic refractive errors were distributed about a modal value of between +0.5 and +1.0 diopter. Forty percent of eyes had no detectable astigmatism. Ninety-seven percent of subjects had no heterophoria. Fusional vergence data are presented.
CONCLUSION: Our results document the complete normal range for selected ophthalmological parameters in normal preschoolers. The values obtained were in general better than expected.
METHODS: We have determined the range of normal function for a number of commonly measured ophthalmological variables in 162 children, classified normal by Gold Standard ophthalmological examination. This group is representative of almost 12,000 normal children aged 4 1/2 to 5 1/2 in Nova Scotia.
RESULTS: In 56.8% of eyes the visual acuity was 6/4.5. The use of a chart with crowding bars was more discriminating between differences in higher levels of acuity and highlighted differences in acuity between the two eyes. Randot stereoacuity showed a uniform, non-Gaussian distribution of scores. Cycloplegic refractive errors were distributed about a modal value of between +0.5 and +1.0 diopter. Forty percent of eyes had no detectable astigmatism. Ninety-seven percent of subjects had no heterophoria. Fusional vergence data are presented.
CONCLUSION: Our results document the complete normal range for selected ophthalmological parameters in normal preschoolers. The values obtained were in general better than expected.