Skip to main content

Research Repository

Advanced Search

The effects of simulated hemianopia on eye movements during text reading

Beh, Anthony; McGraw, Paul V.; Schluppeck, Denis


Anthony Beh

Professor of Visual Neuroscience


Vision loss is a common, devastating complication of cerebral strokes. In some cases the complete contra-lesional visual field is affected, leading to problems with routine tasks and, notably, the ability to read. Although visual information crucial for reading is imaged on the foveal region, readers often extract useful parafoveal information from the next word or two in the text. In hemianopic field loss, parafoveal processing is compromised, shrinking the visual span and resulting in slower reading speeds. Recent approaches to rehabilitation using perceptual training have been able to demonstrate some recovery of useful visual capacity. As gains in visual sensitivity were most pronounced at the border of the scotoma, it may be possible to use training to restore some of the lost visual span for reading. As restitutive approaches often involve prolonged training sessions, it would be beneficial to know how much recovery is required to restore reading ability. To address this issue, we employed a gaze-contingent paradigm using a low-pass filter to blur one side of the text, functionally simulating a visual field defect. The degree of blurring acts as a proxy for visual function recovery that could arise from restitutive strategies, and allows us to evaluate and quantify the degree of visual recovery required to support normal reading fluency in patients. Because reading ability changes with age, we recruited a group of younger participants, and another with older participants who are closer in age to risk groups for ischaemic strokes. Our results show that changes in patterns of eye movement observed in hemianopic loss can be captured using this simulated reading environment. This opens up the possibility of using participants with normal visual function to help identify the most promising strategies for ameliorating hemianopic loss, before translation to patient groups.


Beh, A., McGraw, P. V., & Schluppeck, D. (2023). The effects of simulated hemianopia on eye movements during text reading. Vision Research, 204, Article 108163.

Journal Article Type Article
Acceptance Date Dec 3, 2022
Online Publication Date Dec 21, 2022
Publication Date 2023-03
Deposit Date Dec 22, 2022
Publicly Available Date Dec 22, 2022
Journal Vision Research
Print ISSN 0042-6989
Electronic ISSN 1878-5646
Publisher Elsevier BV
Peer Reviewed Peer Reviewed
Volume 204
Article Number 108163
Keywords Stroke, Eye movements, Reading, Gaze-contingent display, Hemianopia
Public URL
Publisher URL


You might also like

Downloadable Citations