Frequency of naturally occurring strabismus in monkeys

Area of Science:

• Primate ophthalmology
• Comparative animal models

Background:

• Strabismus, or eye misalignment, affects a significant portion of the human population.
• Animal models are crucial for understanding the underlying mechanisms and potential treatments for strabismus.

Purpose of the Study:

• To screen a colony of Macaca nemestrina monkeys for naturally occurring strabismus.
• To characterize the types and incidence of strabismus in this primate population.
• To assess the potential of Macaca nemestrina as a model for human strabismus.

Main Methods:

• Systematic screening of a Macaca nemestrina colony for visual alignment abnormalities.
• Documentation and classification of strabismus cases (esotropia and exotropia).
• Assessment of visual acuity using grating tests in affected individuals.

Main Results:

• Thirteen cases of naturally occurring strabismus were identified, with 12 esotropes and 1 exotrope.
• The observed strabismus characteristics in Macaca nemestrina were comparable to human clinical presentations.
• Four affected monkeys exhibited interocular differences in grating acuity.
• The estimated incidence of strabismus in the colony was 4%.

Conclusions:

• Macaca nemestrina monkeys exhibit naturally occurring strabismus with characteristics similar to humans.
• This primate species represents a valuable model for investigating strabismus.
• Further research can explore the etiological factors and therapeutic strategies for strabismus using this model.