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Natural strabismus in monkeys. Convergence errors assessed by cover test and photographic methods
M W Quick1, H M Eggers, R G Boothe
1Department of Psychology, Emory University, Atlanta, Georgia 30322.
Investigative Ophthalmology & Visual Science
|September 1, 1992
Summary
Naturally occurring strabismus in monkeys shares similarities with human infantile strabismus syndromes. This study characterized alignment errors, providing insights into strabismus development and characteristics.
Area of Science:
- Ophthalmology
- Comparative Medicine
- Neuroscience
Background:
- Infantile strabismus is a common condition in children with various underlying causes.
- Understanding the mechanisms and patterns of strabismus is crucial for effective treatment.
Purpose of the Study:
- To assess binocular alignment in monkeys with naturally occurring infantile strabismus.
- To compare strabismus patterns in monkeys with common human infantile strabismus syndromes.
- To characterize the magnitude and scatter of misalignment in strabismus.
Main Methods:
- Utilized standard clinical prism and cover tests.
- Employed a recently developed photographic method for binocular alignment assessment.
- Conducted extensive measurements across the field of gaze for fixation attempts.
Main Results:
- Two monkeys exhibited patterns consistent with essential infantile esotropia.
- Five monkeys showed patterns aligning with accommodative esotropia.
- Varied presentations included constant-angle esotropia, resolved esotropia, and exophoria.
Conclusions:
- Naturally occurring strabismus in monkeys may parallel human infantile strabismus syndromes.
- This research offers detailed characterization of strabismus magnitude and inter-eye coupling.
- Provides valuable comparative data for strabismus research in both animal models and humans.