Our daughter has had iritis off and on for the last two years. It's happening more often now. . . . She is in college and working in a restaurant and does "stress" about school and finances. She was tested for several auto immune disorders, one of which was ankylosing spondylitis. All the results were negative. She was a soft contact wearer for many years. No doctor EVER saw any evidence of iritis in all the years she was seen by eye doctors. Why would iritis pop up when it did? All I ever hear, is "there is no cause." I cannot believe that. . . .