This is a deeper part of the tear duct. Dissolvable punctal plugs may last up to about a week or up to a couple of months. They have a few uses: After vision-correcting surgery such as LASIK.

is misleading as it implies occluded drainage and solely nasolacrimal duct pathology. 'Normal' tear dynamics cannot be defined, comprising of a complex interplay of tear production, evaporation ...