I feed live and we stun them prior to feeding. Mice do bite....I got bit the other day and it was a pretty nasty little bite that bled allot.
Ugh....this always starts arguements here but we whack them on the head to stun them prior to feeding. I then take long feeding tongs and hold them for the snakes. I do not let them run loose and the snake hunt them. I did read in one of my care books that like the other poster stated...grab them by the scruff of the neck and offer it like that. With tongs of course. This way if you pre-kill you can still make it move. The book also stated after the snake has it give a tug of the tail to make it more realistic. So far stunning them has worked for me. I have to put a disclaimer in here though. It is not the easiest thing to do. I cannot hand pic my feeders...I cannot look at them beforehand. I just have to get them and take care of business. My supplier of feeders knows what I need I walk in and tell her the size and it is done.
I have heard of ppl putting them in a co2 chamber and pre-killing them. You could do that and then try the tong trick.
By the way...If I were you....get a second opinion on the eye thing. I would think they would want to look at it and that there is some kind of drops that they could put in at least to prevent infection. But that could just be me too. There is a guy on here called Critter Vet....shoot him an email. ??