Punctal plugs can be VERY helpful for some with dry eyes. They can be helpful in those with evaporative dry eye and those who do not produce enough tears (aqueous insufficiency). Punctal plugs may not help though, if you have inflammatory dry eye. In some cases, this can be helped by medication (steroids or topical cyclosporin).
Seeing a dry eye specialist can get you on the right road.

Chris Surdykowski