Verguese Lab

Verghese Lab

Our laboratory studies the mechanisms of healthy vision and action, as well as the basis of attention and visual adaptation in clinical populations.

Tabs

Journal Articles
Verghese, P., & Ghahghaei, S.. (2020). Predicting stereopsis in macular degeneration. Journal Of Neuroscience. http://doi.org/10.1523/JNEUROSCI.0491-20.2020
Shanidze, N., & Verghese, P.. (2019). Motion perception in central field loss. Journal Of Vision, 19, 20–20. http://doi.org/10.1167/19.14.20
Presentations/Posters
Safi, M., Verghese, P., & Shanidze, N.. (2020). Effects of task demands on smooth pursuit gain in macular degeneration. Investigative Ophthalmology & Visual Science. Association for Research in Vision and Ophthalmology Annual Meeting: Canceled due to COVID.
Vullings, C., & Verghese, P.. (2019). Binocular scotoma mapping and eye movement patterns in central field loss. Gordon Research Conference on Eye Movements. Lewiston, USA: Lewiston, USA.
Shanidze, N., & Verghese, P.. (2019). Motion Perception in Central Field Loss: Visual Field Contributions. Investigative Ophthalmology & Visual Science. ARVO: Vancouver B.C.

Pages

Active Completed
  • Completed

    Novel Method to Teach Scotoma Awareness

    This project aims to improve visual function in individuals with age-related macular degeneration (AMD). AMD isassociated with central field loss that cannot be corrected optically.

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  • Completed
  • Completed

    Target Selection in the Real World

    Attention and Segmentation

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  • One person looking directly at another person and picking up a cup by the handle, illustrating peripheral stereopsis
    Completed

    Upper Depth Limit Across Visual Field

    Stereopsis is important for tasks of daily living such as eye-hand coordination. It is best in central vision but is also mediated by the periphery. Previously we have shown that individuals with central-field loss who have residual stereopsis in the periphery perform better at an eye-hand-coordination task. Here we sought to determine what sets the limit of stereopsis, defined as the largest disparity that supports the sustained appearance of depth, in the near periphery in healthy individuals. We used a rigorous method to determine the uppermost limit of disparity. The disparity limit is the point at which the threshold for judging dichoptic separation between the half-images is equal to the monocular width-discrimination threshold. The disparity limit at 10° was a factor of 2–4 times larger than the fovea, regardless of the meridian tested. The increase in the disparity limit with eccentricity was shallow, similar to that of Panum's area. Within this disparity limit, disparity increment thresholds were comparable for foveal and peripheral targets, illustrating the significance and utility of peripheral stereopsis, especially in the absence of foveal stereopsis.

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