Tumbling-hand optotype: a novel gesture-based tool for visual acuity assessment in neurodivergent populations

Objective: This study aimed to validate the psychometric properties, feasibility, and clinical utility of the Tumbling-Hand test. Methods: The validation process involved two phases. In neurotypical participants, VA thresholds of the Tumbling-Hand test were compared with the printed Tumbling E test, with repeatability assessed using intraclass correlation coefficients (ICCs) and Bland-Altman analysis. In neurodivergent participants, the feasibility and success rates of the Tumbling-Hand test were evaluated against the Tumbling E and Landolt C tests. Statistical analyses, including McNamar’s and [...]