Related Experiment Videos
Visual acuity assessment of children with neurological impairment using grating and vanishing optotype acuity cards
R T Mackie1, K J Saunders, R E Day
1Department of Vision Sciences, Glasgow Caledonian University, Scotland.
Insights
Vanishing optotype and grating acuity cards show similar testability and visual acuity thresholds in children with neurological impairment. These visual acuity tests can be used interchangeably for clinical assessment in this population.
Area of Science:
- Ophthalmology
- Pediatric Neurology
- Clinical Vision Science
Background:
- Assessing visual acuity in children with neurological impairment presents unique challenges due to diverse age ranges and abilities.
- Traditional grating acuity cards and vanishing optotype acuity cards are commonly used, but their comparative performance in this specific population is not well-established.
Purpose of the Study:
- To compare the testability and visual acuity thresholds obtained using vanishing optotype acuity cards versus traditional grating acuity cards.
- To determine if these two types of visual acuity tests are interchangeable for assessing children with neurological impairment.
Main Methods:
- A diverse group of 91 children (8 months-19 years) with varying learning abilities, from normal to severe disability, were examined.
- Testability (individual success rates) and acuity thresholds (LogMAR units) were recorded for both vanishing optotype and grating acuity cards.
Main Results:
- Individual success rates were comparable between grating (91%) and vanishing optotype (89%) cards.
- No significant difference was found in the mean acuity thresholds between the two card types across a wide range of acuities (0 to 2.0 LogMAR).
- Ninety-three percent of acuity estimates agreed within +/- 0.50 LogMAR units.
Conclusions:
- Vanishing optotype and grating acuity cards demonstrate similar testability and yield comparable visual acuity thresholds in children with neurological impairment.
- The findings support the interchangeable use of these two visual acuity assessment methods in clinical settings for this pediatric population.
Abstract:
We have compared the testability and acuity thresholds achieved with vanishing optotype acuity cards and traditional grating acuity cards when used to examine children with neurological impairment. These children encompass a wide range of ages and abilities and it may be desirable to use the two types of cards for acuity assessment. Subjects were a diverse group of children (n = 91; 8 months-19 years) whose learning ability ranged from normal to severe disability. There was no significant difference between the individual success rates for the two sets of cards (grating 91% (n = 61) vanishing optotype 89% (n = 59)). Over a wide range of acuities (0 to 2.0 LogMAR) the mean difference between acuity thresholds did not differ significantly from zero (p = 0.24). Ninety-three percent of acuity estimates agreed to within +/- 0.50 LogMAR units. The results indicate that the two acuity tests could be used interchangeably in clinical populations of children with neurological impairment.