Infants with nasolacrimal duct obstruction present with a history of chronic or intermittent tearing, and debris on the eyelashes. Conjunctival erythema is not typical, although chronic rubbing of the eyes may cause redness of the lower eyelid.
Adapted with permission from: Paysse EA, Coats DK, Cassidy M. Refinements Volume III/Number 2. San Francisco: American Academy of Opthalmology, 1999.