Comparing visual acuity and optimized visual image quality for individuals with and without Down syndrome.

Area of Science:

• Ophthalmology
• Genetics
• Vision Science

Background:

• Individuals with Down syndrome often exhibit reduced visual acuity.
• The extent to which their visual image quality is compromised remains unclear.
• Visual image quality is a critical factor in visual perception and function.

Purpose of the Study:

• To evaluate the optimized visual image quality in adults with Down syndrome using the visual Strehl ratio (VSX).
• To compare the measured VSX values in individuals with Down syndrome against predicted values for the typical population.
• To assess the relationship between visual acuity and visual image quality in this cohort.

Main Methods:

• Wavefront aberrations were measured in 30 adults with Down syndrome.
• A computational method simulated over 20,000 spectacle prescriptions to find optimal correction.
• Optimized visual Strehl ratio (logVSX) and logMAR visual acuity were calculated and compared to normative data.

Main Results:

• Individuals with Down syndrome showed significantly poorer optimized logVSX values (-0.56 ± 0.19) compared to predicted normal levels (-0.47 to -0.26).
• Visual acuity was also reduced in the Down syndrome group compared to the general population.
• A significant, though modest, correlation was found between visual acuity and optimized logVSX.

Conclusions:

• Adults with Down syndrome possess demonstrably reduced visual image quality (logVSX) compared to their non-Down syndrome peers.
• This reduction persists even when visual corrections are optimized.
• Factors beyond refractive error likely contribute to the visual acuity deficits observed in Down syndrome.