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

Abstract : 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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https://hal.archives-ouvertes.fr/hal-03018189
Contributor : muriel boucart Connect in order to contact the contributor
Submitted on : Sunday, November 22, 2020 - 10:02:25 AM
Last modification on : Sunday, June 26, 2022 - 2:57:49 AM
Long-term archiving on: : Tuesday, February 23, 2021 - 9:39:06 PM

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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, Lippincott, Williams & Wilkins, 2020, 97, pp.871-878. ⟨10.1097/OPX.0000000000001586⟩. ⟨hal-03018189⟩

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