I am a cognitive psychologists and a vision scientist. I am interested in understanding reading problems in order to improve the reading experience. Along with Dr. Chandna, I study higher visual function deficits in children with cerebral visual impairment (CVI). Specifically, in collaboration with with Dr. Chandna I lead the research to investigate how CVI affects reading in each child in order to improve or develop individualized (re)habilitation techniques or assistive technologies. In addition, I am interested to understand how TBI (which is a form of CVI) affects reading in adults. I am also interested in binocular vision (stereopsis, fusion, suppression) and how the two eyes work together during daily living tasks in individuals with normal or abnormal vision, such as strabismus or amblyopia. To do so, I use (i) qualitative methods such as as in-depth interviews, surveys and questionnaires and (ii) quantitative methods such as regression, factor analysis and cluster analysis on objective data (e.g., eye-movements and accommodation measurements; behavioural data on psychophysics experiments or EEG). Furthermore, I develop applications that can be used for research or rehabilitation.
Eccentric power refractors need to be calibrated for accommodation and gaze position for individual participants. Calibration however can be time consuming. We look at different conditions in which calibration is necessary or preferable.
This project is now completed. Please see the Publication section for results.
There is continuing debate as to whether smooth pursuit relies on the foveation of a moving target, especially when the target is compact. Previous studies have shown that gaze is placed on the center-of-mass of a target during saccadic eye movements. This research aims to understand whether eye placement is similarly centered during smooth pursuit and whether foveation is necessary for pursuing a small stimulus.
Crowding increases with eccentricity, and is most readily observed in the periphery. During natural, active vision however, central vision plays an important role. Measures of critical distance to estimate crowding are difficult in central vision, as these distances are small. Any overlap of flankers with the target may create an overlay masking confound. The crowding factor method avoids this issue by simultaneously modulating target size and flanker distance and using a ratio to compare crowded to uncrowded conditions. This method was developed and applied in the periphery (Petrov &…
People with mTBI often complain about dificulty in reading in spite of normal results in usual eye exams. We investigate this issue by looking at accommodation and reading rate and subjective measurement of reading difficuties for a variaty of reading tasks in normal and mTBI population.