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(a) Marginal Reflex Distance 1 (MRD) by Age Groups Proportion of MRD≥4, 3.0–3.9, 2.0–2.9, and <1 mm in right and left eye were presented by age group. Each color represents different group categorized by MRD. (b) Levator Function by Age Groups Proportion of levator function≥12, 8–11, 5–7, and ≤4 in right and left eye were presented by age group. Each color represents different levator function group.
