What is the nature of the reach-and-grasp deficit in glaucoma? - CNRS - Centre national de la recherche scientifique Access content directly
Journal Articles Journal of Glaucoma Year : 2020

What is the nature of the reach-and-grasp deficit in glaucoma?


Purpose: Vision plays an important role in planning and executing manual prehension (reaching and grasping). We assess the impact of glaucoma on motor production, as a function of the visual exploration time available to the patients. Methods: We compared performance in two reach and grasp tasks determined by whether or not the participants (16 glaucoma patients, 14 age-matched and 18 young controls) had time to explore the objects before reaching and grasping a target object defined by its color. Results: Differences were observed between glaucoma patients and age-matched controls on movement duration and peak velocity (reaching phase) only when participants were not provided time to look at the objects before the movement (immediate condition). Conclusions: Glaucoma patients exhibited a motor disorder (grasping phase) only when they had no time to explore their environment before performing the reach-and-grasp task. The motor abnormalities in reaching phase observed in glaucoma patient in previous studies seem to result from difficulties in target identification rather than from visuo-motor deficits. From a clinical point of view, motor performances of glaucoma patients could be modulated by task, especially by temporal constraints of task.
Fichier principal
Vignette du fichier
Reach and Grasp in Glaucoma_2020.pdf (427.02 Ko) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

hal-03018722 , version 1 (23-11-2020)



Xavier Corveleyn, Quentin Lenoble, Jean Francois Rouland, Muriel Boucart. What is the nature of the reach-and-grasp deficit in glaucoma?. Journal of Glaucoma, 2020, ⟨10.1097/IJG.0000000000001555⟩. ⟨hal-03018722⟩
28 View
125 Download



Gmail Facebook X LinkedIn More