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Testing of visual acuity in young children: an evaluation of some commonly used methods
Insights
Comparing visual acuity screening tests for children, the Sheridan test excelled in younger children, while the Snellen chart proved most effective for older children. The E chart is a viable option for school-age screening.
Area of Science:
- Ophthalmology
- Pediatric Optometry
- Vision Screening
Background:
- Accurate visual acuity screening is crucial for early detection of vision impairments in children.
- Various opto-type tests exist, but their effectiveness varies across different age groups and specific visual defects.
Purpose of the Study:
- To compare the efficacy of different visual acuity screening tests in young children.
- To identify the most suitable tests for specific age ranges (3-5 years and 5-7 years).
Main Methods:
- Comparative study involving two age groups: 3-5 years and 5-7 years.
- Tests used included Sheridan's letter matching, Fooks test, E card test, Sheridan-Gardiner test, and Snellen chart.
- Evaluation focused on sensitivity in detecting visual defects and suitability for different age groups.
Main Results:
- For 3-5 year olds, the Sheridan test demonstrated superior results compared to the Fooks and E card tests.
- In 5-7 year olds, the Snellen chart was the most effective, though not universally applicable due to cooperation issues.
- The E chart showed good defect detection with minimal lateral confusion, remaining suitable for school-age screening.
Conclusions:
- The Sheridan test is recommended for younger children (3-5 years).
- The Snellen chart is the preferred method for older children (5-7 years) when cooperation allows.
- The E chart remains a valuable tool for screening normal school-age children.
Abstract:
In a comparative study of screening tests for visual acuity in young children, two groups of children were presented with three different tests. In the younger group (three to five years) three single opto-type tests were compared: Sheridan's five and seven letter matching test, the Fooks test and the E card test. The Sheridan test gave the best results and the E card test was found to be unsuitable for this age-group. The Fooks is an attractive test but was less sensitive in the detection of defects than the Sheridan test. In the older group (five to seven years) a single opto-type test, the Sheridan-Gardiner test, was compared with the E chart and the Snellen chart. The Sheridan-Gardiner test was found to have limitations in the detection of defects, including amblyopia, therefore results obtained by this method should not be considered to be directly comparable with those of the Snellen chart. The E chart gave good results in the detection of defects and there was less lateral confusion than had been expected. It has disadvantages, but there is still a place for its use in the screening of normal school-age children. The Snellen chart was the most effective test in the detection of defects, but not all the children were able to co-operate in its use. It is concluded that where it is possible to use the Snellen chart it should always be the method of choice.