Final visual acuity compared with presenting visual acuity.

aIncludes the patients too young to receive the visual acuity examination and those with presenting symptoms too serious to apply to the visual acuity examination.bIncludes the patients too young to receive the visual acuity examination, those transferred to another health care facility or receiving home health care, and those with missing/unrecorded final visual acuity due to loss of follow-up (55 children).cFinal visual acuity (FVA) is the presented visual acuity of patients at last follow up in the outpatient department of one of the 3 tertiary hospitals, (Spearman's correlation coefficient ρ = 0.659, P