ok, this might seem like a silly question, but does anybody else is worried that candling might be hurting little embryo's eyes? Every time I press this flashlight against it, they start to wiggle around. I read that they do not get eyelids until day 10...
I have never worried about it. I doubt they have any eyesight at all that early, there is a lot of eye, nerve, and brain development that needs to happen to "see" something. Most likely, the chick is responding to the movement of the egg. You just can't see the movement until you put a light to the egg.