Related Experiment Videos
Human strabismus: evaluation of the interhemispheric transmission time and hemiretinal differences using a reaction
M S Roy1, P Lachapelle, R C Polomeno
1Department of Ophthalmology, Hôpital Sainte-Justine, Montreal, Que., Canada.
Behavioural Brain Research
|May 30, 1994
Summary
Strabismus does not affect interhemispheric transmission time (ITT) in humans. However, amblyopic eyes show slower reaction times in the central visual field, suggesting a link to severe amblyopia.
Area of Science:
- Neuroscience
- Ophthalmology
- Visual processing
Background:
- Strabismus in immature animals affects corpus callosum development, potentially impairing interhemispheric visual integration.
- The commissural visual system's function in humans with strabismus requires investigation.
Purpose of the Study:
- To determine if strabismus causes deficits in the human commissural visual system.
- To compare interhemispheric transmission time (ITT) between strabismic and normal subjects.
Main Methods:
- Measured simple unimanual reaction times (RT) in 30 subjects (strabismic and normal).
- Presented lateralized visual targets monocularly at central (4 degrees) and peripheral (35 degrees) eccentricities.
- Assessed effects on central and peripheral hemiretina portions.
Main Results:
- Interhemispheric transmission time (ITT) was not significantly different between strabismic and normal subjects.
- Non-amblyopic strabismic patients showed normal reaction times across visual field portions.
- Amblyopic eyes exhibited reduced response speed in the central visual field (4 degrees).
Conclusions:
- Interhemispheric transmission time appears normal in individuals with strabismus.
- Slower central visual field responses in the amblyopic eye may be linked to the severity of amblyopia.