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Visual Processing in Infantile Nystagmus Is Not Slow.
Investigative Ophthalmology & Visual Science
|August 5, 2015
Summary
Individuals with infantile nystagmus (IN) have delayed eye movements but not slower visual processing once their gaze is fixed. This research clarifies visual function in IN patients.
Area of Science:
- Ophthalmology
- Neuroscience
- Visual Science
Background:
- Infantile nystagmus (IN) can cause subjective reports of improved vision despite minimal acuity gains.
- Subjective improvements may stem from temporal, not spatial, visual function changes.
- Understanding
- time to see
- delays is crucial for IN treatment efficacy.
Purpose of the Study:
- To investigate if
- time to see
- is prolonged in infantile nystagmus (IN) compared to controls.
- To differentiate delays caused by eye movements from underlying visual processing deficits.
Main Methods:
- Measured response times to oriented gratings (central and peripheral) in IN subjects and controls (n=11 each).
- Assessed time to target-acquiring saccades and post-saccade response latency.
- Analyzed eye movement and reaction time data.
Main Results:
- Nystagmus subjects showed a 60 ms delay in target-acquiring saccades (P=0.010).
- No significant difference in post-saccade response time between groups (P=0.37).
- IN subjects exhibited longer response times to gratings at fixation.
Conclusions:
- Individuals with IN require more time to direct gaze toward visual targets.
- Visual processing speed is not impaired once a target is foveated in IN.
- Conscious visual processing is not inherently slow in infantile nystagmus.
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