ArticleFrontiers in neuroscience2025
Contribution of binocular visual function and its impairment by Bangerter foils to the performance of a precision reaching, grasping and placing task in healthy adults.
Article in Frontiers in neuroscience, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: Upper limb movement execution is affected in patients with vision impairments resulting from ocular pathologies or binocular anomalies. Deficits in motor performance have been correlated with reduced contrast sensitivity, phoria, and stereoacuity. Aim: To evaluate the effects of increased straylight induced by Bangerter foils on binocular visual function and examine the corresponding impact on eye-hand kinematics during a high precision reaching, grasping and placement task (i.e., bead threading). Methods: Twenty-one healthy participants, aged 21-41 years, participated in this experimental study. Visual function assessment included visual acuity (VA), contrast sensitivity (CS), stereoacuity (SA), phoria, and fusional vergences (FV). Vision was impaired experimentally using Bangerter foils 0.4. Participants performed a bead threading task under three randomized viewing conditions: binocular baseline (BB; normal vision), binocular viewing with a foil over the dominant eye (FDE), and foils over both eyes (FBE). Eye and hand movements were recorded using an eye tracker and a motion capture camera. Results: Visual functions (VA, CS, and stereoacuity) were impaired when viewing with the Bangerter foils. Pairwise comparison between viewing conditions confirmed statistically significant differences between BB, FDE and FBE for mid to high spatial frequencies (6, 12 and 18 cycles per degree; Conclusion: Inducing short-term deterioration through the alteration of contrast sensitivity at high spatial frequencies without a clinical deterioration in stereopsis does not have a significant impact on precision grasping and placing movements, in a repetitive manual task. Notably, this study demonstrated that phoria impacts the execution of reaching movements.
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