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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.
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hal-03018698 , version 1 (23-11-2020)


  • HAL Id : hal-03018698 , version 1


Xavier Corveleyn, Quentin Lenoble, Jean-François Rouland, Muriel Boucart. What is the Nature of the Reach-and-Grasp Deficit in Glaucoma?. Journal of Glaucoma, 2020. ⟨hal-03018698⟩
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