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Article dans une revue

Visual exploration of objects and scenes in patients with age-related macular degeneration

Abstract : OBJECTIVE: Studies on people with age-related macular degeneration (AMD) have shown that they are able to detect briefly displayed objects and scenes with high accuracy (above 80%). However, in everyday life we explore our environment to search and to recognize objects. We assessed visual exploration in people with AMD during the identification of objects and scenes. METHOD: Twenty patients with AMD, fifteen age-matched and twelve young controls participated. We used colored photographs of isolated objects, natural scenes and objects in scenes, displayed centrally on a monitor. Participants were asked to name the objects and scenes. Ocular movements were recorded during the identification task. Scan paths, saccades, fixations, and accuracy were also recorded. RESULTS: People with AMD exhibited lower accuracy (by about 30%). Eye movement parameters were impaired with a larger number of saccades, shorter fixation durations and a larger scan path than controls. CONCLUSIONS: Our results are consistent with studies on artificial scotoma in normally sighted people showing that a central scotoma impairs oculomotricity. In contrast to detection tasks, people with central vision loss exhibit impaired performance in identification of objects and scenes (62 to 66%). Eye movement studies suggest that the lower accuracy in patients is likely due to the use of peripheral vision and instability of fixation.
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Soumis le : vendredi 15 novembre 2019 - 14:39:06
Dernière modification le : mardi 3 novembre 2020 - 10:26:01





Miguel Thibaut, Céline Delerue, Muriel Boucart, Thi-Ha-Chau Tran. Visual exploration of objects and scenes in patients with age-related macular degeneration. Journal Français D'ophtalmologie, 2016, Journal Français D'ophtalmologie, 39 (1), pp.82-89. ⟨10.1016/j.jfo.2015.08.010⟩. ⟨hal-02365635⟩



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