Find a doctor who specializes in dry eye. Here, I found them at Duke. Finding the right drops is a crap shoot. Also, be careful choosing lenses for cataract surgery as some make dry eye worse. There are treatments like LipiFlow and Blephex that help, though insurance doesn't usually cover these. It is fairly typical for people to lose fluid as they age. Punctal plugs might stem fluid loss. You have other issues is your Meibomium glands, which control the oil, are dysfunctional. The best supplement for dry eye is GLA, gamma linoleic acid, which is--what else--a blood thinner.