AI Article Synopsis
- This study explores how spatial attention affects signal detection in patients with glaucoma, particularly in areas of the visual field that are damaged.
- It compares the performance of glaucoma patients with age-matched controls when identifying letters in crowded versus isolated conditions, finding that pre-cueing the target's location improves detection in patients but not in controls.
- The results suggest that glaucoma patients experience more difficulty with crowding and that directing attention can help enhance their perception in challenged visual areas.
Article Abstract
Clinical Relevance: Measuring the impact of spatial attention on signal detection in damaged parts of the visual field can be a useful tool for eye care practitioners.
Background: Studies on letter perception have shown that glaucoma exacerbates difficulties to detect a target within flankers (crowding) in parafoveal vision. A target can be missed because it is not seen or because attention was not focused at that location. This prospective study evaluates the contribution of spatial pre-cueing on target detection.
Method: Fifteen patients and 15 age-matched controls were presented with letters displayed for 200 ms. Participants were asked to identify the orientation of the target letter T in two conditions: an isolated letter (uncrowded condition) and a letter with two flankers (crowded condition). The spacing between target and flankers was manipulated. The stimuli were randomly displayed at the fovea and at the parafovea at 5° left or right of fixation. A spatial cue preceded the stimuli in 50% of the trials. When present, the cue always signalled the correct location of the target.
Results: Pre-cueing the spatial location of the target significantly improved performance for both foveal and parafoveal presentations in patients but not in controls who were at ceiling level. Unlike controls, patients exhibited an effect of crowding at the fovea with a higher accuracy for the isolated target than for the target flanked by two letters with no spacing between the elements.
Conclusion: Higher susceptibility to central crowding supports data showing abnormal foveal vision in glaucoma. Exogenous orienting of attention facilitates perception in parts of the visual field with reduced sensitivity.
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| http://dx.doi.org/10.1080/08164622.2023.2182185 | DOI Listing |
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