Higher susceptibility to central crowding in glaucoma.

Blanckaert, Edouard; Rouland, Jean-Francois; Davost, Theophile; Warniez, Aude; Boucart, Muriel

Type de document :

Article dans une revue scientifique: Article original

DOI :

10.1080/08164622.2022.2124848

PMID :

36183782

URL permanente :

http://hdl.handle.net/20.500.12210/115428

Titre :

Higher susceptibility to central crowding in glaucoma.

Auteur(s) :

Blanckaert, Edouard [Auteur]
Hôpital Claude Huriez [Lille]
Rouland, Jean-Francois [Auteur]

Lille Neurosciences & Cognition (LilNCog) - U 1172
Davost, Theophile [Auteur]
Hôpital Claude Huriez [Lille]
Warniez, Aude [Auteur]
Lille Neurosciences & Cognition - U 1172 [LilNCog]
Boucart, Muriel [Auteur]

Lille Neurosciences & Cognition (LilNCog) - U 1172

Titre de la revue :

Clinical and Experimental Optometry

Nom court de la revue :

Clin Exp Optom

Pagination :

1-7

Date de publication :

2022-10-04

ISSN :

1444-0938

Mot(s)-clé(s) en anglais :

Central vision
contrast
crowding
glaucoma
parafoveal vision

Discipline(s) HAL :

Sciences du Vivant [q-bio]
Sciences cognitives

Résumé en anglais : [en]

Clinical relevance Crowding limits many daily life activities, such as reading and the visual search for objects in cluttered environments. Excessive sensitivity to crowding, especially in central vision, may amplify the ...
Lire la suite >Clinical relevance Crowding limits many daily life activities, such as reading and the visual search for objects in cluttered environments. Excessive sensitivity to crowding, especially in central vision, may amplify the difficulties of patients with ocular pathologies. It is thus important to investigate what limits visual activities and how to improve it. Background Numerous studies have reported reduced contrast sensitivity in central vision in patients with glaucoma. However, deficits have also been observed for letter recognition at high contrast, suggesting that contrast alone cannot completely account for impaired central perception. Method Seventeen patients and fifteen age-matched controls were randomly presented with letters in central or parafoveal vision at 5° eccentricity for 200 ms. They were asked to decide whether the central T was upright or inverted. The T was either presented in isolation (uncrowded) or flanked by two Hs (crowded) at various spacings. Contrast was manipulated: 60% and 5%. Results Compared to controls, patients exhibited a significant effect of crowding in central vision, with higher accuracy for the isolated T than for HTH only at low contrast. In parafoveal vision, an effect of crowding was also observed only in patients. The spacing to escape crowding varied as a function of contrast. Larger spacing was required at low contrast than at high contrast. Susceptibility to crowding was related to central visual field defect for central presentations and to contrast sensitivity for parafoveal presentations, only at low contrast. Controls were at ceiling level both for central and parafoveal presentations. Conclusion Crowding limits visual perception, impeding reading and object recognition in cluttered environments. Visual field defects and lower contrast sensitivity in glaucoma can increase susceptibility to central and parafoveal crowding, the deleterious effect of which can be improved by manipulating contrast and spacing between elements.Lire moins >

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

Université de Lille
Inserm
CHU Lille

Collections :

Lille Neurosciences & Cognition (LilNCog) - U 1172

Date de dépôt :

2024-06-22T21:57:25Z
2024-07-03T06:44:00Z

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Numéro de version	Lien	Date de modification
2	20.500.12210/115428*	2024-07-03T06:40:30Z
1	20.500.12210/115428.1	2024-06-22T21:57:25Z

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