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Gap effect and express saccades generation in amblyopia.
Maciej Perdziak1,2, Wojciech Gryncewicz1, Dagmara Witkowska1
1Nalecz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, Warsaw, Poland.
Journal of Vision
|April 13, 2019
Summary
Amblyopia (lazy eye) does not affect visual attention or fixation disengagement. Eye movement studies show similar gap effect and express saccade production in amblyopic and control subjects.
Area of Science:
- Neuroscience
- Ophthalmology
- Vision Science
Background:
- Amblyopia is a developmental vision disorder from abnormal visual input in early childhood.
- Spatial vision deficits in amblyopia are known, but neural control of eye movements is less understood.
Purpose of the Study:
- To investigate the gap effect and express saccade generation in amblyopic individuals.
- To compare saccadic latency and express saccade production between amblyopic and control groups.
Main Methods:
- Saccadic latency was measured under "no gap," 50 ms gap, and 200 ms gap conditions.
- Express saccade occurrence was analyzed in strabismic and anisometropic amblyopic subjects and age-matched controls.
Main Results:
- Saccadic latency decreased with gap paradigms in both groups.
- The gap effect size was comparable across groups and viewing conditions.
- Express saccade production was similar between amblyopic and control subjects.
Conclusions:
- Amblyopia does not appear to alter the physiological mechanisms of visual attention/fixation disengagement.
- Gap effect and express saccade production are comparable in normal and amblyopic individuals.
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