Related Experiment Videos
[The relationship between the developmental change in visual acuity measurements and change of refractive error in
1Department of Ophthalmology, Nagoya University School of Medicine, Japan.
Insights
Visual acuity development in infants is slow initially, with high rates of astigmatism in younger babies. Psychological aversion to testing may affect visual acuity measurements.
Area of Science:
- Ophthalmology
- Developmental Pediatrics
Context:
- Infant visual development is crucial for early detection of potential issues.
- Understanding refractive error changes alongside visual acuity is key in pediatric eye care.
Purpose:
- To investigate the relationship between visual acuity development and refractive error changes in normal infants.
- To assess the reliability of visual acuity testing methods in different infant age groups.
Summary:
- A study of 219 infants (3-36 months) used Teller Acuity Cards (TAC) and an infrared video refractor.
- Higher test success rates were observed in 3-6 month olds compared to older infants.
- With-the-rule astigmatism was common in infants aged 3-8 months but decreased with age; visual acuity did not differ between infants with or without astigmatism.
Impact:
- Findings suggest that the slow visual acuity development curve in infants (3-12 months) may be influenced by psychological factors related to TAC testing.
- Highlights the need for age-appropriate and comfortable testing methods in pediatric ophthalmology.
Abstract:
219 normal infants aged 3 to 36 months were tested to investigate the relationship between the development of visual acuity and the change of refractive error. 17 infants were tested over a period of time. Visual acuity was assessed by Teller Acuity Cards (TAC), and refractive error was measured by an infrared video refractor (PR1000) without cycloplegics. The results were as follows. 1) The success rate of both tests in 3 to 6 month-old infants was higher than in infants aged 11 to 14 months and 23 to 36 months. 2) Visual acuity showed a rather slow development in infants aged 3 to 12 months. 3) With-the-rule astigmatism of 1 diopter (D) or more occurred with a high incidence in the 3 to 8 month old infants, and decreased with age. 4) The visual acuity in the infants with astigmatism was no different than in those without it. 5) The slow developmental curve of visual acuity measured in 3 to 12-month old infants was probably the result of psychological aversion to the TAC.