[Zhonghua yan ke za zhi] Chinese journal of ophthalmology
Effects of simulated combined visual acuity and visual field impairments on obstacle avoidance walking and searching abilities
Por Ye SJ, Liu YY, Chen Y y 5 más.
Contenido en inglés
Resumen
Objective
To investigate the interactive effects of combined visual acuity and visual field impairments on obstacle avoidance walking and searching abilities.
Methods
A randomized controlled trial was conducted. Healthy volunteers with normal visual acuity and visual fields were recruited from the Eye Hospital of Wenzhou Medical University between March and September 2024. Binocular presented visual acuity (PVA) was measured using a standard logarithmic visual acuity chart, and binocular visual field was examined using a Humphrey perimeter. Visual function impairments were simulated. Four levels of visual acuity impairment (PVA<0.05, 0.05≤PVA<0.3, 0.3≤PVA<0.5, and PVA≥0.5) were induced by applying occlusion foils of different densities onto the spectacle lenses. Two levels of concentric visual field constriction (visual field radius≤10° and≤20°) were simulated using modified goggle-based tunnel vision simulation glasses. Participants were randomly assigned to four visual acuity simulation groups using computer-generated random numbers, and further randomly assigned in a 1∶2 ratio to the 10° and 20° visual field subgroups within each group. Each participant completed an obstacle avoidance walking task and a target search task under both simulated visual field impairment and normal visual field conditions. The primary outcome measures were task completion time, number of collisions, and target detection rate. The Kruskal-Wallis test and linear mixed-effects model were used for statistical analysis.