Related Experiment Videos
New acuity test for toddlers
J M Woodhouse1, T O Adoh, K A Oduwaiye
1Department of Optometry, University of Wales College, Cardiff, UK.
Insights
This study introduces a novel preferential looking test using familiar shapes to measure visual acuity in toddlers. This engaging method improves testing success rates in young children and those with intellectual impairments.
Area of Science:
- Ophthalmology
- Pediatric Optometry
- Developmental Psychology
Background:
- Preferential looking is standard for infant visual acuity testing.
- Toddlers (1-3 years) are challenging to test due to short attention spans and test boredom.
- Existing grating targets in preferential looking are often unengaging for young children.
Purpose of the Study:
- To develop an engaging preferential looking test for toddlers.
- To improve visual acuity testing accuracy in young children and patients with intellectual impairment.
- To offer an alternative to traditional grating targets.
Main Methods:
- Designed a test using familiar shapes (house, car) on neutral grey cards.
- Shapes are computer-generated and fade at the resolution limit.
- Visual acuity is determined by the width of the shape's white lines.
- Observer tracks eye movements to identify target location, similar to conventional preferential looking.
Main Results:
- The novel test is quick and effective for the toddler age group.
- The use of familiar shapes increases child engagement.
- Successfully tested older patients with intellectual impairment.
Conclusions:
- Familiar shapes in preferential looking tests enhance engagement and improve testing success in toddlers.
- This method offers a viable alternative for visual acuity assessment in challenging pediatric and impaired populations.
- The vanishing optotype chart concept, using engaging visuals, is effective for pediatric visual acuity measurement.
Abstract:
Preferential looking is the technique of choice for measuring visual acuity in infants and young children. Most workers agree that the toddler age group, 1 to 3 years, is the most difficult to test. This is because of their short attention span and restlessness, but mostly because they find the grating target used in the test, frankly boring. The concept of the vanishing optotype chart offers alternative test targets, while utilizing the technique of preferential looking. We have designed a test which comprises a familiar shape (house, car etc.) on the upper or lower part of a neutral grey card. The shape is computer generated, and designed to fade completely when beyond the resolution limit. Acuity is determined by the width of the white lines making up the shape. As with conventional preferential looking, the observer notes the child's eye movements to determine the position of the target shape. Although picture naming is not required, the shapes help to maintain the child's interest in the test. The test is quick, and is successful with the toddler age group and older patients with intellectual impairment.