Do picture-based charts overestimate visual acuity? Comparison of Kay Pictures, Lea Symbols, HOTV and Keeler logMAR charts with Sloan letters in adults and children.
Nicola S AnsticeRobert J JacobsSamantha K SimkinMelissa ThomsonBenjamin ThompsonAndrew V CollinsPublished in: PloS one (2017)
Kay Pictures over-estimated VA in all participants. Variability between Kay Pictures optotypes suggests that shape cues aid in optotype determination. Other pediatric charts offer more comparable VA measures and should be used for children likely to progress to letter charts.