What is the difference between dacryocystitis and dacryadenitis?

The difference between dacryocystitis and dacryadenitis: first, from the anatomical point of view, the location of dacryocystitis and dacryadenitis disease is different. The lacrimal gland is located on the inner side of the orbital wall of the eyeball, while the lacrimal sac is located in the lacrimal sac area; second, the functional difference. The lacrimal gland is the secretion of tears, and the function of the lacrimal sac is to store tears; third, the inflammatory state is different. After the lacrimal gland is inflamed, it will form a decrease in lacrimal gland production, resulting in a decrease in tear volume. The lacrimal sac is the place to accumulate tears. When the tears in the lacrimal sac area accumulate too much, and the nasolacrimal duct patency below the lacrimal sac is poor, it will induce dacryocystitis.