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The central theme of research in our lab is to understand how people with low vision see and recognize the world around them. To this end, we study how the visual system deals with four major aspects of visual deficits that often occur in low vision: blur, low contrast, visual field loss, and abnormal binocular interaction. We are particularly interested in how these deficits affect daily visual activities such as reading, object/face recognition or navigation, and whether there are any perceptual and cortical changes associated with these deficits. We are also interested in developing effective training/rehabilitative regimens to improve the visual function of low vision patients. Our research involves psychophysical, eye tracking, fMRI and computational investigations in normal and visually impaired humans (e.g., macular degeneration, glaucoma, amblyopia and other disorders of the retina and optic nerve).

Our research is funded by the National Institutes of Health (NIH), Research to Prevent Blindness (RPB), and the EyeSight Foundation of Alabama. 

Illustrations of four major aspects of visual deficits:

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Low spatial resolution
which is often associated with refractive error


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Reduced contrast
which is relevant to ocular-media opacity such as cataracts


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Visual field loss
which is often associated with age-related macular degeneration (AMD),
glaucoma and retinitis pigmentosa


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Abnormal binocular interaction
which is relevant to strabismus and amblyopia