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Article Dans Une Revue Journal of Glaucoma Année : 2020

A saccadic choice task for target face detection at large visual eccentricities in patients with glaucoma

Boucart Muriel
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Bachet Valentin
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Corveleyn Xavier
Bacchetti Pascal
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Jean Rouland
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Muriel Boucart
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Résumé

Significance: Little is known about the perception of glaucomatous patients at large visual eccentricities. We show that the patients' performance drops beyond 40° eccentricity even for large images of scenes suggesting that clinical tests should assess the patients' vision at larger eccentricities than 24 or 30°. Purpose: Daily activities such as visual search, spatial navigation and hazard detection require rapid scene recognition on a wide field of view. We examined whether participants with visual field loss at standard automated perimetry 30-2 were able to detect target faces at large visual eccentricities. Methods: Twelve patients with glaucoma and 14 controls were asked to detect a face in a two-alternative saccadic forced choice task. Pairs of scenes, one containing a face, were randomly displayed at 10, 20, 40, 60 or 80° eccentricity on a panoramic screen covering 180° horizontally. Participants were asked to detect and to saccade towards the scene containing a face. Results: Saccade latencies were significantly slower in patients (264ms, CI: 222 to 306ms) than in controls (207ms CI: 190 to 226ms) and accuracy was significantly lower in patients (70% CI: 75% to 85%) than in controls (75.7% CI : 71.5% to 79.5%). Though still significantly above chance at 60°, the patients' performance dropped beyond 40° eccentricity. The controls' performance was still above chance at 80° eccentricity. Conclusions: In patients with various degrees of peripheral visual field defect, performance dropped beyond 40° eccentricity for large images at a high contrast. This result could reflect reduced spread of exploration in glaucoma.
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Dates et versions

hal-03018189 , version 1 (22-11-2020)

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Boucart Muriel, Bachet Valentin, Corveleyn Xavier, Bacchetti Pascal, Jean Rouland, et al.. A saccadic choice task for target face detection at large visual eccentricities in patients with glaucoma. Journal of Glaucoma, 2020, 97, pp.871-878. ⟨10.1097/OPX.0000000000001586⟩. ⟨hal-03018189⟩

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