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The Rotterdam C-chart: norm values for visual acuity and interocular differences in 5-year-old children
1Department of Physiology I, Erasmus University, Rotterdam, The Netherlands.
Behavioural Brain Research
|July 31, 1992
Summary
The new Rotterdam C-chart improves visual acuity testing for children. This chart is suitable for developmental studies and assessing visually impaired children.
Area of Science:
- Ophthalmology
- Pediatric Optometry
Background:
- Conventional C-charts present limitations for assessing visual acuity in young children and those with visual impairments.
- Issues include unequal optotype spacing, inconsistent crowding, insufficient large optotypes, and ceiling effects.
Purpose of the Study:
- To introduce the Rotterdam C-chart, designed with 0.1-log steps and consistent crowding.
- To establish normative values for visual acuity in 5-year-old children using this new chart.
Main Methods:
- The Rotterdam C-chart was used to test visual acuity in 201 five-year-old children at 6m and 40cm distances.
- Results were compared with those from 24 young adults.
Main Results:
- Mean visual acuity in 5-year-olds was lower than in adults, but the distribution patterns were similar.
- The Rotterdam C-chart demonstrated comparable crowding across all lines.
Conclusions:
- The Rotterdam C-chart is a suitable tool for developmental studies of visual acuity.
- It is effective for assessing visual acuity in young children and those with visual impairments.