John P Gorham1, Beau B Bruce1,2,3, Amy K Hutchinson4. 1. The Department of Ophthalmology, Emory University School of Medicine, 1365 B Clifton Rd NE, Atlanta, GA, 30322, USA. 2. Department of Neurology, Emory University School of Medicine, Atlanta, GA, USA. 3. Department of Epidemiology, Emory University Rollins School of Public Health, Atlanta, GA, USA. 4. The Department of Ophthalmology, Emory University School of Medicine, 1365 B Clifton Rd NE, Atlanta, GA, 30322, USA. amy.hutchinson@emory.edu.
Abstract
PURPOSE: The Handy Eye Chart™ is designed to assist in evaluating the visual acuity of patients with non-standard communication styles. The Handy Eye Chart™ has been previously validated against the early treatment diabetic retinopathy study (ETDRS) chart. The aim of this research is to compare visual acuity outcomes with The Handy Eye Chart™ against the international gold standard, the Landolt C chart, in a population of children. METHODS: Sixty participants between the ages of 6 and 18 were recruited at the Pediatric Section of the Department of Ophthalmology at the Emory Eye Center. Visual acuity was evaluated using The Handy Eye Chart™ and the Landolt C Chart, altering the order of administration between charts. The visual acuity data were compared using t test, linear regression, and Bland-Altman analysis. RESULTS: The mean difference in visual acuity was 0.02 logMAR (CI 0.009-0.04, p = 0.002). The correlation coefficient was 0.98. The Bland-Altman analysis shows the 95% limits of agreement between the charts to be -0.14 to 0.09 logMAR. CONCLUSIONS: The Handy Eye Chart™ is a valid measure of visual acuity when compared with the international gold standard, the Landolt C Chart.
PURPOSE: The Handy Eye Chart™ is designed to assist in evaluating the visual acuity of patients with non-standard communication styles. The Handy Eye Chart™ has been previously validated against the early treatment diabetic retinopathy study (ETDRS) chart. The aim of this research is to compare visual acuity outcomes with The Handy Eye Chart™ against the international gold standard, the Landolt C chart, in a population of children. METHODS: Sixty participants between the ages of 6 and 18 were recruited at the Pediatric Section of the Department of Ophthalmology at the Emory Eye Center. Visual acuity was evaluated using The Handy Eye Chart™ and the Landolt C Chart, altering the order of administration between charts. The visual acuity data were compared using t test, linear regression, and Bland-Altman analysis. RESULTS: The mean difference in visual acuity was 0.02 logMAR (CI 0.009-0.04, p = 0.002). The correlation coefficient was 0.98. The Bland-Altman analysis shows the 95% limits of agreement between the charts to be -0.14 to 0.09 logMAR. CONCLUSIONS: The Handy Eye Chart™ is a valid measure of visual acuity when compared with the international gold standard, the Landolt C Chart.