The McKee laboratory is dedicated to psychophysical and other non-invasive measurements of normal and amblyopic vision. Our primary interests include normal and abnormal binocular vision, motion processing and contrast sensitivity.
Tabs
Journal Articles
. (2019). The upper disparity limit increases gradually with eccentricity. Journal Of Vision, 19(11).
. (2010). The precision of binocular and monocular depth judgments in natural settings. Journal Of Vision, 10(10), 1-13.
. (2002). Contour completion through depth interferes with stereoacuity. Vision Research, 42, 2153-162.
. (2000). Stimulus configuration determines the detectability of motion signals in noise. Journal Of The Optical Society Of America. A, Optics, Image Science, And Vision, 17, 1525-34.
. (1999). Local motion detectors cannot account for the detectability of an extended trajectory in noise. Vision Research, 39, 19-30.
. (1992). The classification of amblyopia on the basis of visual and oculomotor performance. Transactions Of The American Ophthalmological Society, 90, 123.
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.
Active
Active
Stereopsis in Macular Degeneration
Macular degeneration affects the central retina, often causing asymmetrical damage to the two eyes. How does this asymmetrical loss affect stereopsis — the percept of depth generated by the small separation of image features in the two eyes? We measured the largest separation between...
Active
Adaptive Visual Strategies for Individuals with Macular Degeneration
In this project we try to gain a better understanding of what visual strategies people use to gather information in the world.
Active
Eye-Hand coordination in Central Field Loss
Eye-hand coordination in AMD
Completed
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.
Contact Information
Email:
suzanne@ski.org
Office Phone:
(415) 345-2070