Estimating the Prevalence and Severity of Isolated Small-Angle Strabismic Amblyopia

Area of Science:

• Ophthalmology
• Pediatric Ophthalmology
• Vision Science

Background:

• Isolated small-angle strabismic amblyopia (is-asa) is difficult to detect in children and may be missed by standard screening tools.
• The prevalence and severity of is-asa have not been well-established, necessitating improved early detection methods.

Purpose of the Study:

• To estimate the prevalence and severity of isolated small-angle strabismic amblyopia (is-asa).
• To inform the development of more effective early screening strategies for is-asa.

Main Methods:

• Combined data from the Multi-Ethnic and Baltimore Pediatric Eye Disease Studies (MEPEDS and BPEDS) to estimate cumulative prevalence.
• Conducted a prospective analysis of Brückner Test images from 2003 to 2025, comparing findings with Alaska population and vision screening data.

Main Results:

• Community screening data suggest is-asa may occur in 1/400 children.
• Prospective analysis in Alaska indicated a prevalence of is-as of about 1 in 700 children and is-asa of about 1 in 7000 children.
• A subset of children with is-asa had residual amblyopia after treatment.

Conclusions:

• Isolated small-angle strabismic amblyopia (is-asa) is a rare condition.
• Future screening methods for is-asa require high specificity.
• Current photorefraction and acuity screening methods are still effective for detecting is-asa due to its rarity.