i had this problem after the young bird season finished with about 6/7 birds out of 40 housed in the section,it started off with 2 birds and over a period of 2/3 days it affected another 5,a quick email sent to rod adams soon put my mind at ease and his reply was "martin this is a widespread problem this year and it is basically an infectious conjunctivitus with or without chlamydia infection,treatment consists of topical antibiotic eyedrops and a course of doxycycline(ornicure)",the eyedrops he advised that i obtained contained chloramphenicol(available in a cream aswell which i'm sure i read in another post that the lads in the north east were using)anyway managed to get the eyedrops from a chemist which were produced by optrex and after 4 days with a single drop in each eye the symptoms were completely gone,anyway hope this helps anyone thats encountering this problem