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Observed and predicted distribution of vision status by age group in persons with trichiasis (n = 319). Vision status: Normal vision = presenting visual acuity of ≥ 6/18 in the better eye; Low vision = presenting visual acuity of < 6/18 to ≤ 3/60 in the better eye; Blindness = presenting visual acuity of < 3/60 in the better eye. Children aged 0–4 years assumed to have normal vision.
