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The differential diagnosis of unexplained crying in young infants includes life-threatening conditions, such as bacterial infection, and less-serious — but presumably painful — conditions, such as hair tourniquet and corneal abrasion. Investigators examined the prevalence of corneal abrasion in 96 infants (age range, 1–12 weeks) who presented without complaints of crying or eye trauma for well-child visits at a single pediatric clinic in Virginia. Examiners applied fluorescein dye drops into the infants' eyes and looked at their corneas with a ring-shaped magnifying glass with a cobalt blue light. After the exam, parents completed a questionnaire about infant behavior during the previous 24 hours, including crying and fussing (defined as no…