The small change in eye length when the focusing muscle contracts or relaxes happens similarly in children and older adults, suggesting this mechanical effect is not unique to growing eyes.
Evidence from Studies
No evidence studies found yet.
What Would Prove This
Per GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this claim, ordered from strongest to weakest.
Whether the magnitude of axial length change during ciliary muscle contraction varies significantly across age groups from childhood to old age.
A systematic review and meta-analysis of all studies measuring axial length changes before and after pharmacological dilation across age groups (children 6–18, adults 19–40, middle-aged 41–65, elderly 66+), using standardized optical biometry and reporting mean change and standard deviation.
Whether the magnitude of axial length change after dilation differs between children and older adults when measured under identical conditions.
A prospective RCT comparing axial length changes after dilation in 100 children (8–14 years) and 100 older adults (65–80 years), matched for refractive error and ocular health, using identical biometry protocols and cycloplegic agents.
Whether the magnitude of axial length change after dilation predicts myopia progression rate differently in children versus adults.
A longitudinal cohort study following 500 individuals from age 8 to 65, measuring axial length change after dilation every 5 years, and tracking refractive error progression to assess whether the effect size predicts myopia onset or stabilization differently by age.
Whether the mean axial length change after dilation differs significantly across age groups in a single population.
A cross-sectional study measuring axial length before and after dilation in 200 participants per age decade (6–15, 16–25, 26–35, 36–45, 46–55, 56–65, 66–75), all with myopia, using standardized optical biometry.
Whether an individual with unusually large or small axial length change after dilation exhibits atypical myopia progression.
A case series of 5 children and 5 older adults with axial length changes >0.05 mm or <0.01 mm after dilation, tracked for 3 years to assess whether their myopia progression deviates from expected norms.