Pupil Dilation (Unknown Cause)

My pupil’s dilate and remain dilated for around 3 days prior to the start of a PsA &/or AS flare. It’s been something of my “warning sign” that a flare is about to begin for the last 5/6 years. It is in no way related to any medications. The cause and reason remains unknown. MS was ruled out last spring, If ANYONE experiences this or has any ideas as to what this is, PLEASE contact me!