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Older preschoolers responded best to vision, refraction tests
Am J Ophthalmol. 2009;148(2):235-241.
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Successful testability in several visual and refractive tests increased significantly with children's age, a Singaporean pediatric population study found.
"The vision and refraction tests were testable in a high proportion of preschool-aged Chinese Singaporeans. Preschool children in older age groups are likely to complete these tests successfully, with important implications for determining age limits for screening in the community and clinic," the study authors said.
The study examined 1,542 Singaporean Chinese children. In children 30 months to younger than 72 months, tests included the Sheridan Gardiner chart, monocular Ishihara color testing (Richmond Products), IOLMaster biometric measurements (Carl Zeiss Meditec) and Randot stereoacuity (Stereo Optical).
In children aged 24 to younger than 72 months, cycloplegic refraction and keratometry measurements were also used with a table-mounted autorefractor (Canon Autorefractor RK-F1).
Clinicians found that testability for visual acuity was 84.4%, with the highest testing rate in children aged 66 months to 72 months.