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Preschool vision testing with a new device, the Scolatest
J L Jacob1, J Milot, Y Beaulieu
1Department of Ophthalmology, hôpital Sainte-Justine, Montreal.
Summary
This study evaluated the Scolatest vision screening device for preschool children. Results suggest a 2.5-meter working distance is reliable for visual acuity testing in young children.
Area of Science:
- Ophthalmology
- Pediatric Optometry
- Public Health Screening
Background:
- Preschool vision screening is crucial for early detection of visual impairments.
- Assessing the reliability of new vision testing devices in young children is essential for effective screening programs.
Purpose of the Study:
- To determine the reliability of the Scolatest, a new vision testing device, when used by school nurses in preschool children.
- To compare the performance of the Scolatest with standard vision testing methods at different distances.
Main Methods:
- 153 children (4-5 years) were tested with Snellen E and Sheridan letters on the Scolatest and a projector.
- 212 children (3-4 years) were tested with Allen and Pigassou symbols on the Scolatest and a projector.
- Tests were conducted at 6m (orthoptist) and 2.5m (school nurse) using different visual acuity charts.
Main Results:
- The Scolatest showed higher accuracy with Pigassou symbols compared to Allen symbols.
- Snellen E and Sheridan letter results were comparable up to 20/30; Snellen E was unreliable beyond this.
- Using the Scolatest at 2.5m with school nurses yielded comparable results across different visual acuity systems.
Conclusions:
- A working distance of 2.5 meters is recommended for preschool vision testing using the Scolatest.
- Visual screening at 2.5 meters should assess acuity beyond the 20/30 standard for comparable results to 6-meter testing.