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Horizontal saccade dynamics after childhood monocular enucleation.
Esther G González1, Linda Lillakas, Alexander Lam
1Vision Science Research Program, Toronto Western Research Institute, University Health Network, Toronto, Canada.
Investigative Ophthalmology & Visual Science
|August 29, 2013
Summary
Monocular vision, even from early enucleation, does not impair saccadic eye movements. Saccade accuracy and speed in one-eyed individuals are comparable to those with normal binocular vision, suggesting intact oculomotor control.
Area of Science:
- Oculomotor control
- Neuroscience
- Vision science
Background:
- Understanding the impact of monocular vision on eye movement control is crucial for visual neuroscience.
- Previous research has not fully elucidated the specific effects of long-term monocularity on saccadic eye movements.
Purpose of the Study:
- To investigate the effects of monocularity on oculomotor control.
- To compare horizontal saccade characteristics in individuals with one eye to age-matched controls viewing monocularly and binocularly.
Main Methods:
- Utilized a video-based remote eye tracker for a no-gap, no-overlap saccadic task.
- Recruited two groups: 15 unilaterally enucleated participants and 18 age-matched controls with normal binocular vision.
Main Results:
- Horizontal saccade dynamics in enucleated individuals mirrored controls viewing monocularly and, largely, binocularly.
- Monocular saccades (both groups) exhibited longer latencies than binocular saccades in controls.
- Saccade accuracy in enucleated observers was comparable to controls, with smaller saccades being more accurate.
Conclusions:
- Early enucleation leading to monocularity does not cause slower visual processing or deficits in saccadic system pathways.
- The findings suggest robust adaptability of the oculomotor system to monocular vision.
