In addition to understanding the adaptive mechanisms of eccentric viewing during smooth pursuit, the ocular motor adaptations of patients with central vision loss give us a better understanding of the basic mechanisms of smooth pursuit in the healthy visual system.
For patients with age-related macular degeneration and controls with normal vision, we examined the closed-loop gain of horizontal and vertical smooth pursuit eye movements as a function of stimulus speed and direction. We hypothesized that pursuit gain functions would be affected by stimulus speed and the location of the preferred retinal locus (PRL) in relation to the scotoma as determined by a fixation stability task using a microperimeter. Specifically, that a PRL on the left of the scotoma in the visual field would decrease the rightward gain relative to the leftward gain and a PRL below the scotoma in the visual field would decrease the upward gain.
Ten patients and 15 controls were tested in a step–ramp procedure with direction (left/right for horizontal motion; up/down for vertical motion), speed (5, 10, 15, 20, and 30 deg/s), and five replication conditions randomized and blocked by orientation (horizontal vs. vertical).
Horizontal pursuit had a higher gain than vertical pursuit. The two eyes of the patients moved conjugately with similar smooth pursuit gains. For horizontal pursuit, all patients, regardless of PRL location, showed significantly better pursuit of leftward motion. For vertical pursuit, downward pursuit had a higher gain than upward pursuit for most patients.
PRL location was not predictive of the directional preponderance of pursuit performance. These results imply that patients may not use the PRL that was initially found during a static fixation task; they may adapt to the task by using a PRL that appears more suitable.
1Krembil Research Institute, Toronto Western Hospital, Toronto, Canada
2Department of Ophthalmology and Vision Sciences, University of Toronto, Canada
3Centre for Vision Research, York University, Toronto, Canada *firstname.lastname@example.org
Submitted: December 9, 2016
Accepted: September 17, 2017
Funding/Support: None of the authors have reported funding/support.
Conflict of Interest Disclosure: None of the authors have reported a conflict of interest.
Author Contributions and Acknowledgments: Conceptualization: EGG, LT-N, MM, MJS; Data curation: EGG, LT-N, EM, MM, MJS; Formal analysis: EGG, LT-N, EM, MM, MJS; Investigation: EGG, LT-N, EM; Methodology: EGG, LT-N, EM, MM, MJS; Project administration: EGG; Resources: EGG, MJS; Supervision: EGG, LT-N, MJS; Validation: EGG, LT-N, MM; Visualization: EGG, LT-N, MJS; Funding acquisition: MJS; Writing – original draft: EGG, LT-N, EM, MM, MJS; Writing – review & editing: EGG, LT-N, EM, MM, MJS.
We gratefully acknowledge the voluntary participation of the patients and controls. We thank Kenwrick Mayo for writing the analysis software. This research was supported by the Vision Science Research Program at the Toronto Western Hospital (EGG and MJS), the Jackman Foundation, the Sir Jules Thorn Charitable Trust, and an anonymous donor.
MJS passed away unexpectedly on June 24, 2017.