It is normal to blink eyes when you shot. But in order to get accurate shooting, you shall try to focus your target so as to help you avoid blinking when shooting. In fact, tiredness can cause frequently blinking of eyes. If you want to avoid eye blinking, get enough sleep before you go a hut is necessary. Hope this can help you.
well,i guess it is really very normal that people will blink while shooting and there is no need to worry about that.Ushould know that blinking is very common so that what u need to do is to try to focus while u r shooting.Do not worry too much,I assure u that this is very normal and definitely not an eye problem.