3 of my chickens have are blind as their eyes have swollen shut because they have fowl pox. They can't open their eyes at all. I am helping them drink and feed as they won't do it on their own. One of them has its comb and face completely covered in the fowl pow black scabs. I have never had them get it this bad before. Shall I keep helping them and will they recover.. or will the eyes be damaged? Will their eyes open again when the scabs have fallen off? Its been just over a week since they first caught the virus.. and one has been blind for a week.. the other two only 3 days. The spots were yellow.. now turned to black. I feel so sorry for them.