Iritis is one of the most serious and complicated eye problem that I know so far, so I don't even know how to explain this disease clearly. Iris refers to the circular and pigmented membrane which provides various colors of eyes. It is located in the middle layer of eyes, in front of the vascular membrane. In its center, there is an opening, to control the light entering eyes, which is called pupil. At the beginning stage, people with iritis would have red eyes and some discomforts of eyes. People might get confused by iritis and conjunctivitis. You should keep it in mind that, red eyes with thick secretion, it should be conjunctivitis; red eyes with no secretion, it should be iritis. If you could start get treatment at the beginning stage, it is very possible to cure it. Otherwise, it might cause vision diminishment. The exactly causes of iritis are still not clear, but there are existing cases to treat iritis with acupuncture. You can have a try.