Recurrent ocular inflammatory episodes begin between the ages of 3 and 12 years (median age of onset 11 years).  These episodes can last from a few days to several weeks and may recur several times a year.  Episodes are milder and less frequent in older individuals.  There is often conjunctival hyperemia accompanied by pain, blurry vision, and photophobia during the acute phase.    In addition, the posterior stroma is edematous and hazy, pseudoguttata may be present, and some patients have a mild anterior chamber reaction.  Visual acuity is normal in most individuals but may be mildly reduced during acute attacks or rarely in older patients with central corneal opacities.  Occasional corneal erosions have been reported.  Between attacks the endothelial cells can appear normal.