Amblyopia in astigmatic preschool children

Area of Science:

• Ophthalmology
• Pediatric Optometry
• Vision Science

Background:

• Astigmatism is common in young children and can affect visual development.
• Meridional amblyopia (MA) is a form of lazy eye linked to astigmatism.
• Early detection and correction of refractive errors are vital for optimal visual outcomes.

Purpose of the Study:

• To investigate the impact of different types of astigmatism on visual acuity in preschool children.
• To determine the relationship between astigmatism and the development of meridional amblyopia.
• To provide evidence-based recommendations for the timing of astigmatism correction.

Main Methods:

• Assessed best-corrected visual acuity using gratings (horizontal and vertical) and recognition optotypes (Lea Symbols).
• Evaluated a cohort of three- to five-year-old children with a high prevalence of astigmatism.
• Categorized participants based on astigmatism type: simple/compound myopic, mixed, and simple/compound hyperopic.

Main Results:

• Children with simple/compound myopic or mixed astigmatism exhibited MA, characterized by reduced horizontal grating acuity.
• Children with simple/compound hyperopic astigmatism did not show MA but had reduced acuity in both grating orientations.
• Both myopic/mixed and hyperopic astigmats demonstrated reduced best-corrected recognition acuity.

Conclusions:

• Optical correction for astigmatism should be implemented before the critical age of three to five years.
• Timely intervention can prevent the development of amblyopia in children with astigmatism.
• Astigmatism correction is essential for achieving normal visual acuity and preventing long-term vision deficits.