Calhoun J H
Pediatric Ophthalmology, Wills Eye Hospital, Philadelphia, Pennsylvania.
Pediatr Clin North Am. 1987 Dec;34(6):1457-65. doi: 10.1016/s0031-3955(16)36368-4.
The lacrimal system is composed of various glands to produce tears and a drainage system for tear removal. The most common abnormality is a defect or blockage in the drainage system, a blocked nasolacrimal duct. Most of the evidence favors conservative management of this condition, reserving probing for those that fail to resolve by one year of age.