Iritis is an eye condition occurring when the iris becomes irritated and inflamed. The Iris is the coloured area around the pupil and will contract and relax in order to protect the pupil from damage from light. The Causes of Iritis It is very little known what causes this and sometimes can be just a one off occasion and the reason for it can be unknown, however sometimes other medical conditions can contribute to this condition. Diseases and illnesses such as ankylosing spondylitits, psoriasis,... more