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An Automated Method for Assessing Visual Acuity in Infants and Toddlers Using an Eye-Tracking System
Published on: March 17, 2023
The handy eye chart: a new visual acuity test for use in children
Caroline H Cromelin1, T Rowan Candy, Michael J Lynn
1The Department of Ophthalmology, Emory University School of Medicine, Atlanta, Georgia, USA.
Ophthalmology
|July 17, 2012
Summary
A new hand-gesture based eye chart offers a valid method for measuring visual acuity in children. This Handy Eye Chart provides results comparable to the standard ETDRS chart for pediatric patients.
Area of Science:
- Ophthalmology
- Pediatric Ophthalmology
- Diagnostic Technology Evaluation
Background:
- Assessing visual acuity in children can be challenging due to symbol familiarity.
- A need exists for a simple, symbol-independent visual acuity test.
Purpose of the Study:
- To design and validate a novel hand-gesture based matching acuity test for children.
- To compare the performance of the Handy Eye Chart with the established Early Treatment Diabetic Retinopathy Study (ETDRS) chart.
Main Methods:
- A diagnostic test evaluation was conducted.
- Sixty children (aged 6-16) with varying visual acuity were recruited.
- Monocular visual acuity was measured using both the Handy Eye Chart and ETDRS chart, with results recorded as logarithm of the minimum angle of resolution (logMAR).
Main Results:
- A strong linear correlation (r=0.95) was observed between the Handy Eye Chart and ETDRS chart.
- The Handy Eye Chart showed a mean difference of -0.03 logMAR, slightly underestimating acuity.
- The 95% limits of agreement were ±1.6 lines, indicating good concordance.
Conclusions:
- The Handy Eye Chart is a valid tool for assessing visual acuity in pediatric patients aged 6-18.
- The chart demonstrates reliability across a range of visual acuities (20/16 to 20/200).
- This hand-gesture based test offers a promising alternative for pediatric vision screening.
