Shape of magnifiers affects controllability in children with visual impairment.

Autor: Liebrand-Schurink J; Behavioural Science Institute, Radboud University Nijmegen, Nijmegen, The Netherlands.; Bartiméus, Institute for the Visually Impaired, Zeist, The Netherlands., Boonstra FN; Bartiméus, Institute for the Visually Impaired, Zeist, The Netherlands.; Donders Institute for Brain, Cognition and Behavior, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands., van Rens GH; VU Medical Centre Amsterdam, Amsterdam, The Netherlands., Cillessen AH; Behavioural Science Institute, Radboud University Nijmegen, Nijmegen, The Netherlands., Meulenbroek RG; Donders Institute for Brain, Cognition and Behavior, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands., Cox RF; Department of Developmental Psychology, University of Groningen, Groningen, The Netherlands.
Jazyk: angličtina
Zdroj: Acta ophthalmologica [Acta Ophthalmol] 2016 Dec; Vol. 94 (8), pp. 761-767. Date of Electronic Publication: 2016 Jun 08.
DOI: 10.1111/aos.13138
Abstrakt: Purpose: This study aimed to examine the controllability of cylinder-shaped and dome-shaped magnifiers in young children with visual impairment.
Methods: This study investigates goal-directed arm movements in low-vision aid use (stand and dome magnifier-like object) in a group of young children with visual impairment (n = 56) compared to a group of children with normal sight (n = 66). Children with visual impairment and children with normal sight aged 4-8 years executed two types of movements (cyclic and discrete) in two orientations (vertical or horizontal) over two distances (10 cm and 20 cm) with two objects resembling the size and shape of regularly prescribed stand and dome magnifiers.
Results: The visually impaired children performed slower movements than the normally sighted children. In both groups, the accuracy and speed of the reciprocal aiming movements improved significantly with age. Surprisingly, in both groups, the performance with the dome-shaped object was significantly faster (in the 10 cm condition and 20 cm condition with discrete movements) and more accurate (in the 20 cm condition) than with the stand-shaped object.
Conclusion: From a controllability perspective, this study suggests that it is better to prescribe dome-shaped than cylinder-shaped magnifiers to young children with visual impairment.
(© 2016 Acta Ophthalmologica Scandinavica Foundation. Published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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