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Quantitative perimetry under binocular viewing conditions in microstrabismus
M V Joosse1, H J Simonsz, H M van Minderhout
1Department of Ophthalmology, University Clinic Dijkzigt, Rotterdam, The Netherlands.
Vision Research
|November 28, 1997
Summary
Suppression scotomata, blind spots in the eye, are not always present in microstrabismus or small angle convergent strabismus. When found, these scotomata in the squinting eye vary in size and depth.
Area of Science:
- Ophthalmology
- Neuroscience
- Visual Science
Background:
- Microstrabismus and small angle convergent strabismus are common visual conditions.
- Suppression scotomata, characterized by reduced visual sensitivity, are thought to occur in these conditions.
- Understanding the characteristics of these scotomata is crucial for diagnosis and treatment.
Purpose of the Study:
- To determine the prevalence, type, size, and depth of suppression scotomata in microstrabismus and small angle convergent strabismus.
- To compare findings between strabismic subjects and normal observers.
Main Methods:
- Binocular static perimetry was conducted on 14 subjects with strabismus and 4 normal observers.
- Subjects fused images on Friedmann visual field analyzers.
- Testing was performed under monocular and binocular viewing conditions, with right and left eyes studied separately.
Main Results:
- Suppression scotomata were detected in 5 out of 14 (36%) strabismic subjects.
- These scotomata, found in the squinting eye, ranged from 5-30 degrees in diameter and 4-14 dB in depth.
- No suppression scotomata were observed in the remaining strabismic subjects or in normal observers.
Conclusions:
- Suppression scotomata are not universally present in all cases of microstrabismus and small angle convergent strabismus.
- When present, these scotomata are centered around the fixation point of the squinting eye, potentially involving the foveal area.
- The size and depth of suppression scotomata exhibit significant variability.