Is iritis considered short-term?

Needs evaluation. Most cases of iritis (a sterile inflammation inside the eye similar to arthritis inside a joint) are spontaneous and not related to any thing else. Some are due to systemic disease association, trauma, etc. The complications of iritis can be serious and you should be seeing an ophthalmolgist right away to avoid these. Treatment is generally very effective.
Usually. Iritis is usually a symptom of trauma, infection or inflammation and can be short term if properly treated. There are certain diseases, however, where it can be chronic and difficult to eradicate.