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Infant astigmatism measured by photorefraction
Insights
Infant astigmatism is common, with 63% of babies under one year having significant astigmatism. This finding impacts understanding visual development and infant acuity.
Area of Science:
- Ophthalmology
- Developmental Biology
- Pediatrics
Background:
- Astigmatism is a common refractive error affecting visual acuity.
- Understanding the prevalence of astigmatism in infants is crucial for early detection and intervention.
- Infant visual development involves critical periods that may be influenced by refractive errors.
Purpose of the Study:
- To determine the prevalence of astigmatism in infants aged 1 day to 12 months.
- To compare infant astigmatism rates with those in adults.
- To explore the implications of infant astigmatism on visual development.
Main Methods:
- Photorefraction was used to assess astigmatism in a sample of 93 infants.
- Infant data was compared to a control group of 26 adults.
- Astigmatism severity and meridian were recorded for all subjects.
Main Results:
- 63% of infants exhibited astigmatism of 0.75 diopters or greater.
- 12% of infants had astigmatism exceeding 2 diopters.
- 70% of infant astigmatism occurred in the horizontal-vertical meridians, contrasting with 8% in adults.
Conclusions:
- Infant astigmatism is significantly more prevalent than in adults.
- High incidence of infant astigmatism suggests potential impacts on critical periods of visual development.
- Further research is needed to understand the long-term effects on infant visual acuity.
Abstract:
Photorefraction of a sample of 93 infants of ages 1 day to 12 months showed that 63 percent of the subjects had astigmatism of 0.75 diopter or greater, and 12 percent greater than 2 diopters. Seventy percent of these astigmatisms were in the horizontal-vertical meridians. By comparison, only 8 percent of a sample of 26 adults tested by the same method showed astigmatism (all 0.75 to 1 diopter). The high incidence of infant astigmatism has implications for critical periods in human visual development and for infant acuity.