We put our 2 yr Welsummer down today because we discovered she was blind in both eyes. 4-5 days ago she was seeing well enough to jump and grab bread from my hand. No way to know if she was seeing well then or just had adapted to judging distinct shadows. Looking back over the last 4 days I realize there were little signs that something wasn't right but I was not clueing in. I feel awful for not picking up on the signs sooner. Does anyone have any idea what could cause this? I am worried it was something she ate but the other birds seem fine.